Remove WebFrame::findChildByExpression.

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 212 matching lines @@
     virtual WebFrame* previousSibling() const = 0;
 
     // Returns the next/previous frame in "frame traversal order"
     // optionally wrapping around.
     virtual WebFrame* traverseNext(bool wrap) const = 0;
     virtual WebFrame* traversePrevious(bool wrap) const = 0;
 
     // Returns the child frame identified by the given name.
     virtual WebFrame* findChildByName(const WebString& name) const = 0;
 
-    // Returns the child frame identified by the given xpath expression.
-    virtual WebFrame* findChildByExpression(const WebString& xpath) const = 0;
-
 
     // Content ------------------------------------------------------------
 
     virtual WebDocument document() const = 0;
 
     virtual WebPerformance performance() const = 0;
 
 
     // Closing -------------------------------------------------------------
 
@@ skipping 428 matching lines @@
     // text form. This is used only by layout tests.
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const = 0;
 
 protected:
     ~WebFrame() { }
 };
 
 } // namespace blink
 
 #endif