Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h

Index: third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h b/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
index 56066def09bf5da55179e5ea291031755826cf78..e39e0ed203cb3752c32c8a1b681701d4f99ae8de 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.h
@@ -164,31 +164,13 @@ private:
         scriptWrappable->disposeWrapper(data);
 
         auto wrapperTypeInfo = reinterpret_cast<WrapperTypeInfo*>(data.GetInternalField(v8DOMWrapperTypeIndex));
-        if (wrapperTypeInfo->isGarbageCollected()) {
-            // derefObject() for garbage collected objects is very cheap, so
-            // we don't delay derefObject to the second pass.
-            //
-            // More importantly, we've already disposed the wrapper at this
-            // moment, so the ScriptWrappable may have already been collected
-            // by GC by the second pass.  We shouldn't use a pointer to the
-            // ScriptWrappable in secondWeakCallback in case of garbage
-            // collected objects.  Thus calls derefObject right now.
-            wrapperTypeInfo->derefObject(scriptWrappable);
-        } else {
-            // For reference counted objects, let's delay the destruction of
-            // the object to the second pass.
-            data.SetSecondPassCallback(secondWeakCallback);
-        }
-    }
-
-    static void secondWeakCallback(const v8::WeakCallbackInfo<ScriptWrappable>& data)
-    {
-        // FIXME: I noticed that 50%~ of minor GC cycle times can be consumed
-        // inside data.GetParameter()->deref(), which causes Node destructions. We should
-        // make Node destructions incremental.
-        auto scriptWrappable = reinterpret_cast<ScriptWrappable*>(data.GetInternalField(v8DOMWrapperObjectIndex));
-        auto wrapperTypeInfo = reinterpret_cast<WrapperTypeInfo*>(data.GetInternalField(v8DOMWrapperTypeIndex));
-        wrapperTypeInfo->derefObject(scriptWrappable);
+        // derefObject() for garbage collected objects is very cheap, so
+        // we don't delay derefObject to any second pass.
+        //
+        // More importantly, we've already disposed the wrapper at this
+        // moment, so the ScriptWrappable may have already been collected
+        // by GC by the second pass.
+        wrapperTypeInfo->derefObject();
     }
 
     v8::Persistent<v8::Object> m_wrapper;