Revert r151669 and r155589 as non-Aura Metro mode is gone

base/win/metro.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 BASE_WIN_METRO_H_
 #define BASE_WIN_METRO_H_
 
 #include <windows.h>
 #include <wpcapi.h>
 
@@ skipping 58 matching lines @@
 BASE_EXPORT HMODULE GetMetroModule();
 
 // Returns true if this process is running as an immersive program
 // in Windows Metro mode.
 BASE_EXPORT bool IsMetroProcess();
 
 // Returns true if the process identified by the handle passed in is an
 // immersive (Metro) process.
 BASE_EXPORT bool IsProcessImmersive(HANDLE process);
 
-// Returns true if this process is running under Text Services Framework (TSF)
-// and browser must be TSF-aware.
-BASE_EXPORT bool IsTSFAwareRequired();
-
 // Allocates and returns the destination string via the LocalAlloc API after
 // copying the src to it.
 BASE_EXPORT wchar_t* LocalAllocAndCopyString(const string16& src);
 
 // Returns true if Windows Parental control activity logging is enabled. This
 // feature is available on Windows Vista and beyond.
 // This function should ideally be called on the UI thread.
 BASE_EXPORT bool IsParentalControlActivityLoggingOn();
 
 // Returns the type of launch and the activation params. For example if the
@@ skipping 33 matching lines @@
 
 // Function to un-pin a site-specific tile (bookmark) from the start screen.
 typedef void (*MetroUnPinFromStartScreen)(
     const string16& title_id,
     const MetroPinUmaResultCallback& callback);
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_METRO_H_