Remove PerBrowser launcher, reland step 1 of 2

ash/launcher/launcher_delegate.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_LAUNCHER_LAUNCHER_DELEGATE_H_
 #define ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 #include "base/strings/string16.h"
@@ skipping 28 matching lines @@
 class ASH_EXPORT LauncherDelegate {
  public:
   // Launcher owns the delegate.
   virtual ~LauncherDelegate() {}
 
   // Invoked when the user clicks on a window entry in the launcher.
   // |event| is the click event. The |event| is dispatched by a view
   // and has an instance of |views::View| as the event target
   // but not |aura::Window|. If the |event| is of type KeyEvent, it is assumed
   // that this was triggered by keyboard action (Alt+<number>) and special
-  // handling might happen (PerApp launcher).
+  // handling might happen.
   virtual void ItemSelected(const LauncherItem& item,
                             const ui::Event& event) = 0;
 
   // Returns the title to display for the specified launcher item.
   virtual base::string16 GetTitle(const LauncherItem& item) = 0;
 
   // Returns the context menumodel for the specified item on
   // |root_window|.  Return NULL if there should be no context
   // menu. The caller takes ownership of the returned model.
   virtual ui::MenuModel* CreateContextMenu(const LauncherItem& item,
@@ skipping 25 matching lines @@
   virtual bool ShouldShowTooltip(const LauncherItem& item) = 0;
 
   // Callback used to allow delegate to perform initialization actions that
   // depend on the Launcher being in a known state.
   virtual void OnLauncherCreated(Launcher* launcher) = 0;
 
   // Callback used to inform the delegate that a specific launcher no longer
   // exists.
   virtual void OnLauncherDestroyed(Launcher* launcher) = 0;
 
-  // True if the running launcher is the per application launcher.
-  virtual bool IsPerAppLauncher() = 0;
-
   // Get the launcher ID from an application ID.
   virtual LauncherID GetLauncherIDForAppID(const std::string& app_id) = 0;
 
   // Pins an app with |app_id| to launcher. A running instance will get pinned.
   // In case there is no running instance a new launcher item is created and
   // pinned.
   virtual void PinAppWithID(const std::string& app_id) = 0;
 
   // Check if the app with |app_id_| is pinned to the launcher.
   virtual bool IsAppPinned(const std::string& app_id) = 0;
 
   // Unpins any app item(s) whose id is |app_id|. The new launcher will collect
   // all items under one item, the old launcher might have multiple items.
   virtual void UnpinAppsWithID(const std::string& app_id) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_DELEGATE_H_