Remove base/win/metro.{cc|h} and some associated code

chrome/app/main_dll_loader_win.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.
 
 // This file defines a class to load the main DLL of a Chrome process.
 
 #ifndef CHROME_APP_MAIN_DLL_LOADER_WIN_H_
 #define CHROME_APP_MAIN_DLL_LOADER_WIN_H_
 
 #include <windows.h>  // NOLINT
@@ skipping 37 matching lines @@
 
  private:
   // Loads chrome.dll, populating |version| with the version of the DLL loaded
   // and |module| with the path of the loaded DLL. Returns a reference to the
   // module, or null on failure.
   HMODULE Load(base::string16* version, base::FilePath* module);
 
  private:
   HMODULE dll_;
   std::string process_type_;
-  const bool metro_mode_;
 };
 
 // Factory for the MainDllLoader. Caller owns the pointer and should call
 // delete to free it.
 MainDllLoader* MakeMainDllLoader();
 
 #endif  // CHROME_APP_MAIN_DLL_LOADER_WIN_H_