Fix warnings.

lib/compiler/implementation/js_backend/emitter.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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 321 matching lines @@
     // (4) foo$3$c(a, b, c) => foo$4(a, b, c, null);
     // (5) foo$3$d(a, b, d) => foo$4(a, b, null, d);
     // (6) foo$4$c$d(a, b, c, d) => foo$4(a, b, c, d);
     // (7) Same as (5).
     //
     // We need to generate a stub for (5) because the order of the
     // stub arguments and the real method may be different.
 
     int count = 0;
     int indexOfLastOptionalArgumentInParameters = positionalArgumentCount - 1;
-    TreeElements elements = 
+    TreeElements elements =
         compiler.enqueuer.resolution.getCachedElements(member);
 
     parameters.forEachParameter((Element element) {
       String jsName = JsNames.getValid(element.name.slowToString());
       if (count < positionalArgumentCount) {
         parametersBuffer[count] = jsName;
         argumentsBuffer[count] = jsName;
       } else {
         int index = names.indexOf(element.name);
         if (index != -1) {
@@ skipping 91 matching lines @@
         addParameterStubs(member, defineInstanceMember);
       }
     } else if (member.kind !== ElementKind.FIELD) {
       compiler.internalError('unexpected kind: "${member.kind}"',
                              element: member);
     }
     emitExtraAccessors(member, defineInstanceMember);
   }
 
   String generateCheckedSetter(Element member, String fieldName) {
-    Type type = member.computeType(compiler);
+    DartType type = member.computeType(compiler);
     if (type.element.isTypeVariable()
         || type.element == compiler.dynamicClass
         || type.element == compiler.objectClass) {
       // TODO(ngeoffray): Support type checks on type parameters.
       return null;
     } else {
       SourceString helper = compiler.backend.getCheckedModeHelper(type);
       Element helperElement = compiler.findHelper(helper);
       String helperName = compiler.namer.isolateAccess(helperElement);
       String additionalArgument = compiler.namer.operatorIs(type.element);
@@ skipping 750 matching lines @@
         sourceName = token.slowToString();
       }
       int totalOffset = bufferOffset + offset;
       sourceMapBuilder.addMapping(
           sourceFile, token.charOffset, sourceName, totalOffset);
     });
   }
 }
 
 typedef void DefineMemberFunction(String invocationName, CodeBuffer definition);