aura: Remove unused Window::Blur().

ui/aura/window.h

 // Copyright (c) 2012 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 UI_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 248 matching lines @@
   // purposes of event targeting.
   Window* GetEventHandlerForPoint(const gfx::Point& local_point);
 
   // Returns the topmost Window with a delegate containing |local_point|.
   Window* GetTopWindowContainingPoint(const gfx::Point& local_point);
 
   // Returns this window's toplevel window (the highest-up-the-tree anscestor
   // that has a delegate set).  The toplevel window may be |this|.
   Window* GetToplevelWindow();
 
-  // Claims or relinquishes the claim to focus.
+  // Claims focus.
   void Focus();
-  void Blur();
 
   // Returns true if the Window is currently the focused window.
   bool HasFocus() const;
 
   // Returns true if the Window can be focused.
   bool CanFocus() const;
 
   // Returns true if the Window can receive events.
   bool CanReceiveEvents() const;
 
@@ skipping 263 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_