Enable inspector tests disabled when dart:html was switched to JS interop.

Source/bindings/core/dart/DartHandleProxy.h

Index: Source/bindings/core/dart/DartHandleProxy.h
diff --git a/Source/bindings/core/dart/DartHandleProxy.h b/Source/bindings/core/dart/DartHandleProxy.h
index e3b7b760289d856a2d3caa89ab0173092c857e6f..0d2988cd41d0c50acaf982ded67208c873727ca3 100644
--- a/Source/bindings/core/dart/DartHandleProxy.h
+++ b/Source/bindings/core/dart/DartHandleProxy.h
@@ -53,6 +53,7 @@ public:
     static v8::Handle<v8::Value> evaluate(Dart_Handle target, Dart_Handle expression, Dart_Handle localVariables);
 
     static bool isDartProxy(v8::Handle<v8::Value>);
+    static bool isDartProxy(v8::Handle<v8::Value>, v8::Isolate*);
     static const char* getJavaScriptType(v8::Handle<v8::Value>);
     static Node* toNativeNode(v8::Handle<v8::Value>);
     static Dart_Handle unwrapValue(v8::Handle<v8::Value>);