Remove triple-shift from dart2js.

pkg/compiler/lib/src/parser/parser.dart

Index: pkg/compiler/lib/src/parser/parser.dart
diff --git a/pkg/compiler/lib/src/parser/parser.dart b/pkg/compiler/lib/src/parser/parser.dart
index f2e0577937e91946b398e1e8040ae978ff95a8ae..42e432becd9afb93159aeec24e8c832ec9477ad6 100644
--- a/pkg/compiler/lib/src/parser/parser.dart
+++ b/pkg/compiler/lib/src/parser/parser.dart
@@ -780,10 +780,6 @@ class Parser {
         token = new SymbolToken(GT_INFO, token.charOffset);
         token.next = new SymbolToken(GT_INFO, token.charOffset + 1);
         token.next.next = next;
-      } else if (identical(token.stringValue, '>>>')) {
-        token = new SymbolToken(GT_INFO, token.charOffset);
-        token.next = new SymbolToken(GT_GT_INFO, token.charOffset + 1);
-        token.next.next = next;
       }
       endStuff(count, begin, token);
       return expect('>', token);