Rename blahHandler to onBlah throughout dart:io.

runtime/bin/directory_impl.dart

Index: runtime/bin/directory_impl.dart
diff --git a/runtime/bin/directory_impl.dart b/runtime/bin/directory_impl.dart
index d5a9953b38fb08b9cf9bb3633e1c41d30cfcdd5a..7042bb12102db46564564372ca8ccd7fa613ac61 100644
--- a/runtime/bin/directory_impl.dart
+++ b/runtime/bin/directory_impl.dart
@@ -35,10 +35,10 @@ class _Directory implements Directory {
     request[1] = _path;
     _directoryService.call(request).receive((result, replyTo) {
       var handler =
-          (_existsHandler != null) ? _existsHandler : (result) => null;
+          (_onExists != null) ? _onExists : (result) => null;
       if (result < 0) {
-        if (_errorHandler != null) {
-          _errorHandler("Diretory exists test failed: $_path");
+        if (_onError != null) {
+          _onError("Diretory exists test failed: $_path");
         }
       } else {
         handler(result == 1);
@@ -63,9 +63,9 @@ class _Directory implements Directory {
     request[1] = _path;
     _directoryService.call(request).receive((result, replyTo) {
       if (result) {
-        if (_createHandler != null) _createHandler();
-      } else if (_errorHandler != null) {
-        _errorHandler("Directory creation failed: $_path");
+        if (_onCreate != null) _onCreate();
+      } else if (_onError != null) {
+        _onError("Directory creation failed: $_path");
       }
     });
   }
@@ -86,9 +86,9 @@ class _Directory implements Directory {
     _directoryService.call(request).receive((result, replyTo) {
       if (result is !List) {
         _path = result;
-        if (_createTempHandler != null) _createTempHandler();
-      } else if (_errorHandler != null) {
-        _errorHandler("Could not create temporary directory [$_path]: " +
+        if (_onCreateTemp != null) _onCreateTemp();
+      } else if (_onError != null) {
+        _onError("Could not create temporary directory [$_path]: " +
                       "${result[1]}");
       }
     });
@@ -117,12 +117,12 @@ class _Directory implements Directory {
     request[2] = recursive;
     _directoryService.call(request).receive((result, replyTo) {
       if (result) {
-        if (_deleteHandler != null) _deleteHandler();
-      } else if (_errorHandler != null) {
+        if (_onDelete != null) _onDelete();
+      } else if (_onError != null) {
         if (recursive) {
-          _errorHandler("Recursive directory deletion failed: $_path");
+          _onError("Recursive directory deletion failed: $_path");
         } else {
-          _errorHandler("Non-recursive directory deletion failed: $_path");
+          _onError("Non-recursive directory deletion failed: $_path");
         }
       }
     });
@@ -151,57 +151,57 @@ class _Directory implements Directory {
     responsePort.receive((message, replyTo) {
       if (message is !List || message[0] is !int) {
         responsePort.close();
-        if (_errorHandler != null) _errorHandler("Internal error");
+        if (_onError != null) _onError("Internal error");
         return;
       }
       switch (message[0]) {
         case kListDirectory:
-          if (_dirHandler != null) _dirHandler(message[1]);
+          if (_onDir != null) _onDir(message[1]);
           break;
         case kListFile:
-          if (_fileHandler != null) _fileHandler(message[1]);
+          if (_onFile != null) _onFile(message[1]);
           break;
         case kListError:
-          if (_errorHandler != null) _errorHandler(message[1]);
+          if (_onError != null) _onError(message[1]);
           break;
         case kListDone:
           responsePort.close();
-          if (_doneHandler != null) _doneHandler(message[1]);
+          if (_onDone != null) _onDone(message[1]);
           break;
       }
     });
   }
 
-  void set dirHandler(void dirHandler(String dir)) {
-    _dirHandler = dirHandler;
+  void set onDir(void onDir(String dir)) {
+    _onDir = onDir;
   }
 
-  void set fileHandler(void fileHandler(String file)) {
-    _fileHandler = fileHandler;
+  void set onFile(void onFile(String file)) {
+    _onFile = onFile;
   }
 
-  void set doneHandler(void doneHandler(bool completed)) {
-    _doneHandler = doneHandler;
+  void set onDone(void onDone(bool completed)) {
+    _onDone = onDone;
   }
 
-  void set existsHandler(void existsHandler(bool exists)) {
-    _existsHandler = existsHandler;
+  void set onExists(void onExists(bool exists)) {
+    _onExists = onExists;
   }
 
-  void set createHandler(void createHandler()) {
-    _createHandler = createHandler;
+  void set onCreate(void onCreate()) {
+    _onCreate = onCreate;
   }
 
-  void set createTempHandler(void createTempHandler()) {
-    _createTempHandler = createTempHandler;
+  void set onCreateTemp(void onCreateTemp()) {
+    _onCreateTemp = onCreateTemp;
   }
 
-  void set deleteHandler(void deleteHandler()) {
-    _deleteHandler = deleteHandler;
+  void set onDelete(void onDelete()) {
+    _onDelete = onDelete;
   }
 
-  void set errorHandler(void errorHandler(String error)) {
-    _errorHandler = errorHandler;
+  void set onError(void onError(String error)) {
+    _onError = onError;
   }
 
   void _closePort(ReceivePort port) {
@@ -212,14 +212,14 @@ class _Directory implements Directory {
 
   String get path() { return _path; }
 
-  var _dirHandler;
-  var _fileHandler;
-  var _doneHandler;
-  var _existsHandler;
-  var _createHandler;
-  var _createTempHandler;
-  var _deleteHandler;
-  var _errorHandler;
+  var _onDir;
+  var _onFile;
+  var _onDone;
+  var _onExists;
+  var _onCreate;
+  var _onCreateTemp;
+  var _onDelete;
+  var _onError;
 
   String _path;
   SendPort _directoryService;