Move addStylesheetByURL from WebFrame to WebLocalFrame.

Source/web/WebLocalFrameImpl.h

Index: Source/web/WebLocalFrameImpl.h
diff --git a/Source/web/WebLocalFrameImpl.h b/Source/web/WebLocalFrameImpl.h
index 1ae010cd2e9695a5828ac9adf9761c043338920b..28b1dc0ec02b015770fcb09ddca6c1c837d2f877 100644
--- a/Source/web/WebLocalFrameImpl.h
+++ b/Source/web/WebLocalFrameImpl.h
@@ -183,7 +183,6 @@ public:
     virtual bool setEditableSelectionOffsets(int start, int end) OVERRIDE;
     virtual bool setCompositionFromExistingText(int compositionStart, int compositionEnd, const WebVector<WebCompositionUnderline>& underlines) OVERRIDE;
     virtual void extendSelectionAndDelete(int before, int after) OVERRIDE;
-    virtual void addStyleSheetByURL(const WebString& url) OVERRIDE;
     virtual void setCaretVisible(bool) OVERRIDE;
     virtual int printBegin(const WebPrintParams&, const WebNode& constrainToNode) OVERRIDE;
     virtual float printPage(int pageToPrint, WebCanvas*) OVERRIDE;
@@ -232,6 +231,9 @@ public:
     virtual bool selectionStartHasSpellingMarkerFor(int from, int length) const OVERRIDE;
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const OVERRIDE;
 
+    // WebLocalFrame methods:
+    virtual void addStyleSheetByURL(const WebString& url) OVERRIDE;
+
     void willDetachParent();
 
     static WebLocalFrameImpl* create(WebFrameClient*);