Remove PerBrowser launcher, reland step 1 of 2

chrome/browser/ui/ash/launcher/chrome_launcher_controller.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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
-
-#include "ash/ash_switches.h"
-#include "base/command_line.h"
-#include "chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.h"
-#include "chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_browser.h"
-
-// statics
-ChromeLauncherController* ChromeLauncherController::instance_ = NULL;
-
-// static
-ChromeLauncherController* ChromeLauncherController::CreateInstance(
-    Profile* profile,
-    ash::LauncherModel* model) {
-  // We do not check here for re-creation of the ChromeLauncherController since
-  // it appears that it might be intentional that the ChromeLauncherController
-  // can be re-created.
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-          ash::switches::kAshDisablePerAppLauncher))
-    instance_ = new ChromeLauncherControllerPerApp(profile, model);
-  else
-    instance_ = new ChromeLauncherControllerPerBrowser(profile, model);
-  return instance_;
-}
-
-ChromeLauncherController::~ChromeLauncherController() {
-  if (instance_ == this)
-    instance_ = NULL;
-}
-
-bool ChromeLauncherController::IsPerAppLauncher() {
-  if (!instance_)
-    return false;
-  return instance_->GetPerAppInterface() != NULL;
-}