Extract InterceptorData from JavaScriptBackend.

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

Index: pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart b/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
index bd3a080c37fcbdb293cb056a1e6e17326cb62509..613336b8bf846e64aad47c8482c83877ea97b315 100644
--- a/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
@@ -966,7 +966,7 @@ class FragmentEmitter {
     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();