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

chrome/browser/ui/views/frame/browser_frame_ashwin.cc

-// Copyright 2013 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.
-
-#include "chrome/browser/ui/views/frame/browser_frame_ashwin.h"
-
-#include "base/bind.h"
-#include "base/message_loop/message_loop.h"
-#include "chrome/browser/browser_shutdown.h"
-#include "chrome/browser/metro_utils/metro_chrome_win.h"
-#include "ui/aura/remote_window_tree_host_win.h"
-
-BrowserFrameAshWin::BrowserFrameAshWin(BrowserFrame* browser_frame,
-                                       BrowserView* browser_view)
-    : BrowserFrameAsh(browser_frame, browser_view) {
-}
-
-BrowserFrameAshWin::~BrowserFrameAshWin() {
-}
-
-void BrowserFrameAshWin::OnWindowFocused(aura::Window* gained_focus,
-                                         aura::Window* lost_focus) {
-  BrowserFrameAsh::OnWindowFocused(gained_focus, lost_focus);
-  if (GetNativeWindow() != gained_focus)
-    return;
-
-  // TODO(shrikant): We need better way to handle chrome activation.
-  // There may be cases where focus events do not follow a user
-  // action to create or focus a window
-
-  // If the activated window is in Metro mode, and the viewer process window is
-  // not in the foreground, activate Metro Chrome.
-  if (aura::RemoteWindowTreeHostWin::IsValid() &&
-      !aura::RemoteWindowTreeHostWin::Instance()->IsForegroundWindow() &&
-      !browser_shutdown::IsTryingToQuit()) {
-    // PostTask because ActivateMetroChrome can not be called nested in another
-    // ::SendMessage().
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(base::IgnoreResult(chrome::ActivateMetroChrome)));
-  }
-}