bindings: Stop using the given creationContext in public APIs.

Source/web/WebDOMError.cpp

Index: Source/web/WebDOMError.cpp
diff --git a/Source/web/WebDOMError.cpp b/Source/web/WebDOMError.cpp
index d4a7f907f79447097c42a3385dfb20897aa89131..507738cbf8742a3732a93bf91313e1383bcacc52 100644
--- a/Source/web/WebDOMError.cpp
+++ b/Source/web/WebDOMError.cpp
@@ -67,11 +67,13 @@ WebString WebDOMError::message() const
     return m_private->message();
 }
 
-v8::Local<v8::Value>  WebDOMError::toV8Value(v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
+v8::Local<v8::Value>  WebDOMError::toV8Value(v8::Local<v8::Object> /* creationContext */, v8::Isolate* isolate)
 {
+    // We no longer use |creationContext| because it's often misused and points
+    // to a context faked by user script.
     if (!m_private.get())
         return v8::Local<v8::Value>();
-    return toV8(m_private.get(), creationContext, isolate);
+    return toV8(m_private.get(), isolate->GetCurrentContext()->Global(), isolate);
 }
 
 WebDOMError::WebDOMError(DOMError* error)