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

apps/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 "apps/app_host/binaries_installer.h"
+#include "apps/app_host/update.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()) {
@@ skipping 20 matching lines @@
                                            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;
 }