Enable TsfBridge to re-initialize

ui/base/ime/win/tsf_bridge.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_BASE_IME_WIN_TSF_BRIDGE_H_
 #define UI_BASE_IME_WIN_TSF_BRIDGE_H_
 
 #include <Windows.h>
 #include <msctf.h>
 
@@ skipping 26 matching lines @@
   // Sets the thread local instance. Must be called before any calls to
   // GetInstance().
   static bool Initialize();
 
   // Injects an alternative TSFBridge such as MockTSFBridge for testing. The
   // injected object should be released by the caller. This function returns
   // previous TSFBridge pointer with ownership.
   static TSFBridge* ReplaceForTesting(TSFBridge* bridge);
 
   // Destroys the thread local instance.
-  virtual void Shutdown() = 0;
+  static void Shutdown();
 
   // Handles TextInputTypeChanged event. RWHVW is responsible for calling this
   // handler whenever renderer's input text type is changed. Does nothing
   // unless |client| is focused.
   virtual void OnTextInputTypeChanged(TextInputClient* client) = 0;
 
   // Sends an event to TSF manager that the text layout should be updated.
   virtual void OnTextLayoutChanged() = 0;
 
   // Cancels the ongoing composition if exists.
@@ skipping 22 matching lines @@
  private:
   // Releases TLS instance.
   static void Finalize(void* data);
 
   DISALLOW_COPY_AND_ASSIGN(TSFBridge);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_WIN_TSF_BRIDGE_H_