Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/FileInvalidArgumentsTest.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #import("dart:io");
 
 class FileTest {
   static void testOpenInvalidArgs(name, [writable = false]) {
     var file = new File(name);
     try {
       file.openSync();
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('open file'));
     }
 
-    file.errorHandler = (s) {
+    file.onError = (s) {
       Expect.isTrue(s.contains('open file'));
     };
-    file.openHandler = () {
+    file.onOpen = () {
       Expect.fail('non-string name open');
     };
     file.open();
   }
 
   static void testExistsInvalidArgs(name) {
     var file = new File(name);
     try {
       file.existsSync();
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('is not a string'));
     }
 
-    file.errorHandler = (s) {
+    file.onError = (s) {
       Expect.isTrue(s.contains('is not a string'));
     };
-    file.existsHandler = (bool) {
+    file.onExists = (bool) {
       Expect.fail('non-string name exists');
     };
     file.exists();
   }
 
   static void testCreateInvalidArgs(name) {
     var file = new File(name);
     try {
       file.createSync();
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('Cannot create file'));
     }
 
-    file.errorHandler = (s) {
+    file.onError = (s) {
       Expect.isTrue(s.contains('Cannot create file'));
     };
-    file.createHandler = (created) {
+    file.onCreate = (created) {
       Expect.fail('non-string name exists');
     };
     file.create();
   }
 
   static void testReadListInvalidArgs(buffer, offset, length) {
     String filename = getFilename("tests/vm/data/fixed_length_file");
     var file = (new File(filename)).openSync();
     try {
       file.readListSync(buffer, offset, length);
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('Invalid arguments'));
     }
 
     var errors = 0;
-    file.errorHandler = (s) {
+    file.onError = (s) {
       errors++;
       Expect.isTrue(s.contains('Invalid arguments'));
     };
-    file.readListHandler = (bytes) {
+    file.onReadList = (bytes) {
       Expect.fail('read list invalid arguments');
     };
     file.readList(buffer, offset, length);
-    file.closeHandler = () {
+    file.onClose = () {
       Expect.equals(1, errors);
     };
     file.close();
   }
 
   static void testWriteByteInvalidArgs(value) {
     String filename = getFilename("tests/vm/data/fixed_length_file");
     var file = (new File(filename + "_out")).openSync(FileMode.WRITE);
     try {
       file.writeByteSync(value);
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('Invalid argument'));
     }
 
     var errors = 0;
-    file.errorHandler = (s) {
+    file.onError = (s) {
       errors++;
       Expect.isTrue(s.contains('Invalid argument'));
     };
     var calls = 0;
-    file.noPendingWriteHandler = () {
+    file.onNoPendingWrite = () {
       if (++calls > 1) Expect.fail('write list invalid argument');
     };
     file.writeByte(value);
-    file.closeHandler = () {
+    file.onClose = () {
       Expect.equals(1, errors);
     };
     file.close();
   }
 
   static void testWriteListInvalidArgs(buffer, offset, bytes) {
     String filename = getFilename("tests/vm/data/fixed_length_file");
     var file = (new File(filename + "_out")).openSync(FileMode.WRITE);
     try {
       file.writeListSync(buffer, offset, bytes);
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('Invalid arguments'));
     }
 
     var errors = 0;
-    file.errorHandler = (s) {
+    file.onError = (s) {
       errors++;
       Expect.isTrue(s.contains('Invalid arguments'));
     };
     var calls = 0;
-    file.noPendingWriteHandler = () {
+    file.onNoPendingWrite = () {
       if (++calls > 1) Expect.fail('write string invalid argument');
     };
     file.writeList(buffer, offset, bytes);
-    file.closeHandler = () {
+    file.onClose = () {
       Expect.equals(1, errors);
     };
     file.close();
   }
 
   static void testWriteStringInvalidArgs(string) {
     String filename = getFilename("tests/vm/data/fixed_length_file");
     var file = new File(filename + "_out");
     file.openSync(FileMode.WRITE);
     try {
       file.writeString(string);
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('writeString failed'));
     }
 
     var errors = 0;
-    file.errorHandler = (s) {
+    file.onError = (s) {
       errors++;
       Expect.isTrue(s.contains('writeString failed'));
     };
     var calls = 0;
-    file.noPendingWriteHandler = () {
+    file.onNoPendingWrite = () {
       if (++calls > 1) Expect.fail('write list invalid argument');
     };
     file.writeString(string);
-    file.closeHandler = () {
+    file.onClose = () {
       Expect.equals(1, errors);
     };
     file.close();
   }
 
   static void testFullPathInvalidArgs(name) {
     var file = new File(name);
     try {
       file.fullPathSync();
       Expect.fail('exception expected');
     } catch (var e) {
       Expect.isTrue(e is FileIOException);
       Expect.isTrue(e.toString().contains('fullPath failed'));
     }
 
-    file.errorHandler = (s) {
+    file.onError = (s) {
       Expect.isTrue(s.contains('fullPath failed'));
     };
-    file.fullPathHandler = (path) {
+    file.onFullPath = (path) {
       Expect.fail('full path invalid argument');
     };
     file.fullPath();
   }
 
   static String getFilename(String path) =>
       new File(path).existsSync() ? path : 'runtime/' + path;
 }
 
 main() {
   FileTest.testOpenInvalidArgs(0);
   FileTest.testOpenInvalidArgs('name', 0);
   FileTest.testExistsInvalidArgs(0);
   FileTest.testCreateInvalidArgs(0);
   FileTest.testReadListInvalidArgs(12, 0, 1);
   FileTest.testReadListInvalidArgs(new List(10), '0', 1);
   FileTest.testReadListInvalidArgs(new List(10), 0, '1');
   FileTest.testWriteByteInvalidArgs('asdf');
   FileTest.testWriteListInvalidArgs(12, 0, 1);
   FileTest.testWriteListInvalidArgs(new List(10), '0', 1);
   FileTest.testWriteListInvalidArgs(new List(10), 0, '1');
   FileTest.testFullPathInvalidArgs(12);
 }