Incorporates feedback by Nicolas for UTF-8 bytes based scanner CL

sdk/lib/_internal/compiler/implementation/scanner/scanner_task.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.
 
 part of scanner;
 
 class ScannerTask extends CompilerTask {
   ScannerTask(Compiler compiler) : super(compiler);
   String get name => 'Scanner';
 
@@ skipping 22 matching lines @@
     if (compiler.preserveComments) {
       tokens = compiler.processAndStripComments(tokens);
     }
     compiler.dietParser.dietParse(compilationUnit, tokens);
   }
 
   /**
    * Returns the tokens for the [source].
    *
    * The [StringScanner] implementation works on strings that end with a '0'
-   * value ('\x00'). If [source] does not with '0', the string is copied before
-   * scanning.
+   * value ('\x00'). If [source] does not end with '0', the string is copied
+   * before scanning.
    */
   Token tokenize(String source) {
     return measure(() {
       return new StringScanner.fromString(source, includeComments: false)
           .tokenize();
     });
   }
 }
 
 class DietParserTask extends CompilerTask {
   DietParserTask(Compiler compiler) : super(compiler);
   final String name = 'Diet Parser';
 
   dietParse(CompilationUnitElement compilationUnit, Token tokens) {
     measure(() {
       Function idGenerator = compiler.getNextFreeClassId;
       ElementListener listener =
           new ElementListener(compiler, compilationUnit, idGenerator);
       PartialParser parser = new PartialParser(listener);
       parser.parseUnit(tokens);
     });
   }
 }