Remove PerBrowser launcher, reland step 1 of 2

ash/ash_switches.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 "ash/ash_switches.h"
 
 #include "base/command_line.h"
 
 namespace ash {
 namespace switches {
@@ skipping 48 matching lines @@
     "ash-enable-auto-window-placement";
 
 // Disables the limitter to throttle how quickly a user
 // can change display settings.
 const char kAshDisableDisplayChangeLimiter[] =
     "ash-disable-display-change-limiter";
 
 // If present new lock animations are enabled.
 const char kAshDisableNewLockAnimations[] = "ash-disable-new-lock-animations";
 
-// Disable the per application grouping version of the launcher.
-const char kAshDisablePerAppLauncher[] = "ash-disable-per-app-launcher";
-
 // Disable immersive fullscreen mode, regardless of default setting.
 const char kAshDisableImmersiveFullscreen[] =
     "ash-disable-immersive-fullscreen";
 
 #if defined(OS_CHROMEOS)
 // Disable compositor based mirroring.
 const char kAshDisableSoftwareMirroring[] = "ash-disable-software-mirroring";
 
 // Disable the notification when a low-power USB charger is connected.
 const char kAshDisableUsbChargerNotification[] =
@@ skipping 118 matching lines @@
 }
 
 bool UseUsbChargerNotification() {
   return !CommandLine::ForCurrentProcess()->
       HasSwitch(ash::switches::kAshDisableUsbChargerNotification);
 }
 #endif
 
 }  // namespace switches
 }  // namespace ash