Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/loader/SinkDocument.cpp

Index: Source/core/loader/SinkDocument.cpp
diff --git a/Source/core/loader/SinkDocument.cpp b/Source/core/loader/SinkDocument.cpp
index a4464abe1ad5224fff9683f47371ebdf683af721..c7a3a12c604fd9be9fc875fa049794e9a2c85420 100644
--- a/Source/core/loader/SinkDocument.cpp
+++ b/Source/core/loader/SinkDocument.cpp
@@ -47,8 +47,8 @@ private:
     virtual size_t appendBytes(const char*, size_t) OVERRIDE { return 0; }
 };
 
-SinkDocument::SinkDocument(Frame* frame, const KURL& url)
-    : HTMLDocument(frame, url)
+SinkDocument::SinkDocument(const DocumentInitializer& initializer)
+    : HTMLDocument(initializer)
 {
     setCompatibilityMode(QuirksMode);
     lockCompatibilityMode();