Change core lib, dart2js, and more for new optional parameters syntax

lib/compiler/implementation/string_validator.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.
 
 // Check the validity of string literals.
 
 #library("stringvalidator");
 
 #import("leg.dart");
 #import("scanner/scannerlib.dart");
@@ skipping 12 matching lines @@
     int leftQuote = quoting.leftQuoteLength;
     int rightQuote = quoting.rightQuoteLength;
     SourceString content = source.copyWithoutQuotes(leftQuote, rightQuote);
     return validateString(token,
                           token.charOffset + leftQuote,
                           content,
                           quoting);
   }
 
   DartString validateInterpolationPart(Token token, StringQuoting quoting,
-                                       [bool isFirst = false,
-                                        bool isLast = false]) {
+                                       {bool isFirst: false,
+                                        bool isLast: false}) {
     SourceString source = token.value;
     int leftQuote = 0;
     int rightQuote = 0;
     if (isFirst) leftQuote = quoting.leftQuoteLength;
     if (isLast) rightQuote = quoting.rightQuoteLength;
     SourceString content = source.copyWithoutQuotes(leftQuote, rightQuote);
     return validateString(token,
                           token.charOffset + leftQuote,
                           content,
                           quoting);
@@ skipping 134 matching lines @@
       }
     }
     // String literal successfully validated.
     if (quoting.raw || !containsEscape) {
       // A string without escapes could just as well have been raw.
       return new DartString.rawString(string, length);
     }
     return new DartString.escapedString(string, length);
   }
 }