Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/html/PluginDocument.cpp

Index: Source/core/html/PluginDocument.cpp
diff --git a/Source/core/html/PluginDocument.cpp b/Source/core/html/PluginDocument.cpp
index b4f129cb8f6e185fa97a95da8d5300a3a5a95dd8..f8bc8297afdcef852b6e477dd4555eb1162083cf 100644
--- a/Source/core/html/PluginDocument.cpp
+++ b/Source/core/html/PluginDocument.cpp
@@ -156,8 +156,8 @@ PluginView* PluginDocumentParser::pluginView() const
     return 0;
 }
 
-PluginDocument::PluginDocument(Frame* frame, const KURL& url)
-    : HTMLDocument(frame, url, PluginDocumentClass)
+PluginDocument::PluginDocument(const DocumentInitializer& initializer)
+    : HTMLDocument(initializer, PluginDocumentClass)
     , m_shouldLoadPluginManually(true)
 {
     setCompatibilityMode(QuirksMode);