Remove PerBrowser launcher, reland step 1 of 2

ash/shell/launcher_delegate_impl.h

 // 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.
 
 #ifndef ASH_SHELL_LAUNCHER_DELEGATE_IMPL_H_
 #define ASH_SHELL_LAUNCHER_DELEGATE_IMPL_H_
 
 #include "ash/launcher/launcher_delegate.h"
 #include "base/compiler_specific.h"
 
@@ skipping 21 matching lines @@
       const ash::LauncherItem& item,
       aura::RootWindow* root) OVERRIDE;
   virtual ash::LauncherMenuModel* CreateApplicationMenu(
       const ash::LauncherItem&,
       int event_flags) OVERRIDE;
   virtual ash::LauncherID GetIDByWindow(aura::Window* window) OVERRIDE;
   virtual bool IsDraggable(const ash::LauncherItem& item) OVERRIDE;
   virtual bool ShouldShowTooltip(const LauncherItem& item) OVERRIDE;
   virtual void OnLauncherCreated(Launcher* launcher) OVERRIDE;
   virtual void OnLauncherDestroyed(Launcher* launcher) OVERRIDE;
-  virtual bool IsPerAppLauncher() OVERRIDE;
   virtual LauncherID GetLauncherIDForAppID(const std::string& app_id) OVERRIDE;
   virtual void PinAppWithID(const std::string& app_id) OVERRIDE;
   virtual bool IsAppPinned(const std::string& app_id) OVERRIDE;
   virtual void UnpinAppsWithID(const std::string& app_id) OVERRIDE;
 
  private:
   // Used to update Launcher. Owned by main.
   WindowWatcher* watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherDelegateImpl);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_LAUNCHER_DELEGATE_IMPL_H_