dart2js: Fix hints in code base.

pkg/compiler/lib/src/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 1316 matching lines @@
           loadedLibraries.containsLibrary(DART_MIRRORS)) {
         // TODO(johnniwinther): Move computation of dependencies to the library
         // loader.
         Uri rootUri = loadedLibraries.rootUri;
         Set<String> importChains = new Set<String>();
         // The maximum number of full imports chains to process.
         final int chainLimit = 10000;
         // The maximum number of imports chains to show.
         final int compactChainLimit = verbose ? 20 : 10;
         int chainCount = 0;
-        bool limitExceeded = false;
         loadedLibraries.forEachImportChain(DART_MIRRORS,
             callback: (Link<Uri> importChainReversed) {
           Link<CodeLocation> compactImportChain = const Link<CodeLocation>();
           CodeLocation currentCodeLocation =
               new UriLocation(importChainReversed.head);
           compactImportChain = compactImportChain.prepend(currentCodeLocation);
           for (Link<Uri> link = importChainReversed.tail;
                !link.isEmpty;
                link = link.tail) {
             Uri uri = link.head;
@@ skipping 1160 matching lines @@
   InterfaceType streamType([DartType elementType]) {
     InterfaceType type = streamClass.computeType(compiler);
     if (elementType == null) {
       return streamClass.rawType;
     }
     return type.createInstantiation([elementType]);
   }
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);