Extract InterceptorData from JavaScriptBackend.

pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart

 // Copyright (c) 2015, 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.js_emitter.startup_emitter.model_emitter;
 
 /// The name of the property that stores the tear-off getter on a static
 /// function.
 ///
 /// This property is only used when isolates are used.
@@ skipping 948 matching lines @@
       addFunOrName(stubMethod);
     }
 
     js.ArrayInitializer callNameArray =
         new js.ArrayInitializer(callNames.map(js.quoteName).toList());
     js.ArrayInitializer funsOrNamesArray = new js.ArrayInitializer(funsOrNames);
 
     bool isIntercepted = false;
     if (method is InstanceMethod) {
       MethodElement element = method.element;
-      isIntercepted = backend.isInterceptedMethod(element);
+      isIntercepted = backend.interceptorData.isInterceptedMethod(element);
     }
     int requiredParameterCount = 0;
     js.Expression optionalParameterDefaultValues = new js.LiteralNull();
     if (method.canBeApplied) {
       requiredParameterCount = method.requiredParameterCount;
       optionalParameterDefaultValues =
           _encodeOptionalParameterDefaultValues(method);
     }
 
     return js.js.statement(
@@ skipping 405 matching lines @@
     }
     statements.add(js.js.statement("setOrUpdateInterceptorsByTag(#);",
         js.objectLiteral(interceptorsByTag)));
     statements.add(
         js.js.statement("setOrUpdateLeafTags(#);", js.objectLiteral(leafTags)));
     statements.addAll(subclassAssignments);
 
     return new js.Block(statements);
   }
 }