Update partial parser and scanner to be able to skip expressions like "new Map<S, T>()".

dart/lib/compiler/implementation/scanner/partial_parser.dart

Index: dart/lib/compiler/implementation/scanner/partial_parser.dart
diff --git a/dart/lib/compiler/implementation/scanner/partial_parser.dart b/dart/lib/compiler/implementation/scanner/partial_parser.dart
index 1e792d0410d289bdf483dfab28e04626e6489b8f..2199ddef8c6bdf8239b9c0764a0e17d96ad9cf9c 100644
--- a/dart/lib/compiler/implementation/scanner/partial_parser.dart
+++ b/dart/lib/compiler/implementation/scanner/partial_parser.dart
@@ -54,9 +54,8 @@ class PartialParser extends Parser {
           continue;
         }
       }
-      if (!mayParseFunctionExpressions && value === '{')
-        return token;
-      if ((value !== '<') && (token is BeginGroupToken)) {
+      if (!mayParseFunctionExpressions && value === '{') return token;
+      if (token is BeginGroupToken) {
         BeginGroupToken begin = token;
         token = (begin.endGroup !== null) ? begin.endGroup : token;
       }