Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/loader/DocumentLoader.cpp

Index: Source/core/loader/DocumentLoader.cpp
diff --git a/Source/core/loader/DocumentLoader.cpp b/Source/core/loader/DocumentLoader.cpp
index bd0d5d123dfd32f1adcf9a6a74dbdd61a43c48e6..bad402e4592193e57110bd54761d000f9281c86d 100644
--- a/Source/core/loader/DocumentLoader.cpp
+++ b/Source/core/loader/DocumentLoader.cpp
@@ -1056,7 +1056,7 @@ PassRefPtr<DocumentWriter> DocumentLoader::createWriterFor(Frame* frame, const D
     // inherit an aliased security context.
     RefPtr<Document> document = DOMImplementation::createDocument(mimeType, frame, url, frame->inViewSourceMode());
     if (document->isPluginDocument() && document->isSandboxed(SandboxPlugins))
-        document = SinkDocument::create(frame, url);
+        document = SinkDocument::create(DocumentInitializer(url, frame));
     bool shouldReuseDefaultView = frame->loader()->stateMachine()->isDisplayingInitialEmptyDocument() && frame->document()->isSecureTransitionTo(url);
 
     RefPtr<DOMWindow> originalDOMWindow;