Move addStylesheetByURL from WebFrame to WebLocalFrame.

public/web/WebLocalFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include "WebFrame.h"
 
 namespace blink {
@@ skipping 13 matching lines @@
     BLINK_EXPORT static WebLocalFrame* frameForCurrentContext();
 
     // Returns the frame corresponding to the given context. This can return 0
     // if the context is detached from the frame, or if the context doesn't
     // correspond to a frame (e.g., workers).
     BLINK_EXPORT static WebLocalFrame* frameForContext(v8::Handle<v8::Context>);
 
     // Returns the frame inside a given frame or iframe element. Returns 0 if
     // the given element is not a frame, iframe or if the frame is empty.
     BLINK_EXPORT static WebLocalFrame* fromFrameOwnerElement(const WebElement&);
+
+    // Navigation Transitions  ---------------------------------------------
+    virtual void addStyleSheetByURL(const WebString& url) = 0;
 };
 
 } // namespace blink
 
 #endif // WebLocalFrame_h