dart2js: In minified mode shorter getter and setter names.

sdk/lib/_internal/compiler/implementation/closure.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.
 
 library closureToClassMapper;
 
 import "elements/elements.dart";
 import "dart2jslib.dart";
 import "dart_types.dart";
 import "scanner/scannerlib.dart" show Token;
@@ skipping 52 matching lines @@
 
 class ClosureFieldElement extends ElementX {
   ClosureFieldElement(SourceString name, ClassElement enclosing)
       : super(name, ElementKind.FIELD, enclosing);
 
   bool isInstanceMember() => true;
   bool isAssignable() => false;
   // The names of closure variables don't need renaming, since their use is very
   // simple and they have 1-character names in the minified mode.
   bool hasFixedBackendName() => true;
+  bool fieldAccessNeverThrows() => true;
   String fixedBackendName() => name.slowToString();
 
   DartType computeType(Compiler compiler) => compiler.types.dynamicType;
 
   String toString() => "ClosureFieldElement($name)";
 }
 
 class ClosureClassElement extends ClassElementX {
   ClosureClassElement(SourceString name,
                       Compiler compiler,
@@ skipping 571 matching lines @@
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     bool oldInTryStatement = inTryStatement;
     inTryStatement = true;
     node.visitChildren(this);
     inTryStatement = oldInTryStatement;
   }
 }