Finish strong mode cleaning of dart2js.

pkg/compiler/lib/src/ssa/interceptor_simplifier.dart

 // Copyright (c) 2013, 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.
 
 import '../common_elements.dart' show CommonElements;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../elements/entities.dart';
 import '../js_backend/interceptor_data.dart';
 import '../types/types.dart';
@@ skipping 53 matching lines @@
         instruction.block.remove(instruction);
       }
       instruction = next;
     }
   }
 
   bool visitInstruction(HInstruction instruction) => false;
 
   bool visitInvoke(HInvoke invoke) {
     if (!invoke.isInterceptedCall) return false;
-    var interceptor = invoke.inputs[0];
+    dynamic interceptor = invoke.inputs[0];
     if (interceptor is! HInterceptor) return false;
 
     // TODO(sra): Move this per-call code to visitInterceptor.
     //
     // The interceptor is visited first, so we get here only when the
     // interceptor was not rewritten to a single shared replacement.  I'm not
     // sure we should substitute a constant interceptor on a per-call basis if
     // the interceptor is already available in a local variable, but it is
     // possible that all uses can be rewritten to use different constants.
 
@@ skipping 336 matching lines @@
       instruction = new HInvokeDynamicMethod(
           selector, mask, inputs, node.instructionType, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }