Revert 127714 - Load the metro driver dll at startup

chrome/app/metro_driver_win.cc

-// Copyright (c) 2011 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 "metro_driver_win.h"
-
-namespace {
-// The windows 8 metro driver dll name and entry point.
-const char kMetroDriverDll[] = "metro_driver.dll";
-// This environment variable controls the loading of the metro driver DLL.
-const char* kMetroModeEnvVar = "CHROME_METRO_DLL";
-
-typedef int (*InitMetro)(LPTHREAD_START_ROUTINE thread_proc, void* context);
-
-struct Context {
-  MetroDriver::MainFn fn;
-  HINSTANCE instance;
-};
-
-DWORD WINAPI MainThread(void* param) {
-  Context* context = reinterpret_cast<Context*>(param);
-  int rv = context->fn(context->instance);
-  delete context;
-  return rv;
-}
-
-}  // namespace
-
-MetroDriver::MetroDriver() : init_metro_fn_(NULL) {
-  if (0 != ::GetEnvironmentVariableA(kMetroModeEnvVar, NULL, 0))
-    return;
-  // We haven't tried to load the metro driver, this probably means we are the
-  // browser. Find it or not we set the environment variable because we don't
-  // want to keep trying in the child processes.
-  HMODULE metro_dll = ::LoadLibraryA(kMetroDriverDll);
-  ::SetEnvironmentVariableA(kMetroModeEnvVar, metro_dll ? "1" : "0");
-  if (!metro_dll)
-    return;
-  init_metro_fn_ =
-      ::GetProcAddress(::GetModuleHandleA(kMetroDriverDll), "InitMetro");
-}
-
-int MetroDriver::RunInMetro(HINSTANCE instance, MainFn main_fn) {
-  Context* context = new Context;
-  context->fn = main_fn;
-  context->instance = instance;
-
-  return reinterpret_cast<InitMetro>(init_metro_fn_)(&MainThread, context);
-}