Fix a number of editor errors and warnings in io tests

tests/standalone/src/io/FileTest.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.
 //
 // Dart test program for testing file I/O.
 
 #import("dart:io");
 #import("dart:isolate");
 
 class MyListOfOneElement implements List {
@@ skipping 736 matching lines @@
   }
 
   // Tests buffer out of bounds exception.
   static void testBufferOutOfBoundsException() {
     bool exceptionCaught = false;
     bool wrongExceptionCaught = false;
     File file = new File(tempDirectory.path + "/out_buffer_out_of_bounds");
     RandomAccessFile openedFile = file.openSync(FileMode.WRITE);
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.readListSync(buffer, 0, 12);
+      openedFile.readListSync(buffer, 0, 12);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.readListSync(buffer, 6, 6);
+      openedFile.readListSync(buffer, 6, 6);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.readListSync(buffer, -1, 1);
+      openedFile.readListSync(buffer, -1, 1);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.readListSync(buffer, 0, -1);
+      openedFile.readListSync(buffer, 0, -1);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.writeListSync(buffer, 0, 12);
+      openedFile.writeListSync(buffer, 0, 12);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.writeListSync(buffer, 6, 6);
+      openedFile.writeListSync(buffer, 6, 6);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.writeListSync(buffer, -1, 1);
+      openedFile.writeListSync(buffer, -1, 1);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     exceptionCaught = false;
     try {
       List<int> buffer = new List<int>(10);
-      bool readDone = openedFile.writeListSync(buffer, 0, -1);
+      openedFile.writeListSync(buffer, 0, -1);
     } catch (IndexOutOfRangeException ex) {
       exceptionCaught = true;
     } catch (Exception ex) {
       wrongExceptionCaught = true;
     }
     Expect.equals(true, exceptionCaught);
     Expect.equals(true, !wrongExceptionCaught);
     openedFile.closeSync();
     file.deleteSync();
   }
@@ skipping 233 matching lines @@
       testWriteVariousLists();
       testDirectory();
       testDirectorySync();
     });
   }
 }
 
 main() {
   FileTest.testMain();
 }