Move app_host target from c/b/extensions into src/apps.

chrome/browser/extensions/app_host/app_host_main.cc

-// 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.
-
-#include <windows.h>
-
-#include "base/at_exit.h"
-#include "base/command_line.h"
-#include "base/file_path.h"
-#include "base/logging.h"
-#include "base/process_util.h"
-#include "chrome/browser/extensions/app_host/binaries_installer.h"
-#include "chrome/browser/extensions/app_host/update.h"
-#include "chrome/installer/launcher_support/chrome_launcher_support.h"
-
-int APIENTRY wWinMain(HINSTANCE, HINSTANCE, wchar_t*, int) {
-  base::AtExitManager exit_manager;
-
-  // Initialize the commandline singleton from the environment.
-  CommandLine::Init(0, NULL);
-
-  base::FilePath chrome_exe(chrome_launcher_support::GetAnyChromePath());
-  if (chrome_exe.empty()) {
-    LOG(INFO) << "No Chrome executable could be found. Let's install it.";
-    HRESULT hr = app_host::InstallBinaries();
-    if (FAILED(hr)) {
-      LOG(ERROR) << "Failed to install the Chrome Binaries. Error: " << hr;
-      return 1;
-    } else {
-      chrome_exe = chrome_launcher_support::GetAnyChromePath();
-      if (chrome_exe.empty()) {
-        LOG(ERROR) << "Failed to find the Chrome Binaries despite a "
-                   << "'successful' installation.";
-        return 1;
-      }
-    }
-  }
-
-  CommandLine chrome_exe_command_line(chrome_exe);
-  chrome_exe_command_line.AppendArguments(
-      *CommandLine::ForCurrentProcess(), false);
-  // Launch Chrome before checking for update, for faster user experience.
-  bool launch_result = base::LaunchProcess(chrome_exe_command_line,
-                                           base::LaunchOptions(), NULL);
-  if (launch_result)
-    LOG(INFO) << "Delegated to Chrome executable at " << chrome_exe.value();
-  else
-    LOG(INFO) << "Failed to launch Chrome executable at " << chrome_exe.value();
-
-  app_host::EnsureAppHostUpToDate();
-
-  return !launch_result;
-}