Remove ShelfItemDelegate::IsDraggable; check for app list button.

chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc

 // Copyright 2014 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/app_window_launcher_item_controller.h"
 
 #include <algorithm>
 
 #include "ash/wm/window_util.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
@@ skipping 118 matching lines @@
   } else {
     return ShowAndActivateOrMinimize(window_to_show);
   }
 }
 
 base::string16 AppWindowLauncherItemController::GetTitle() {
   return LauncherControllerHelper::GetAppTitle(launcher_controller()->profile(),
                                                app_id());
 }
 
-bool AppWindowLauncherItemController::IsDraggable() {
-  return true;
-}
-
 bool AppWindowLauncherItemController::CanPin() const {
   return GetPinnableForAppID(app_id(), launcher_controller()->profile()) ==
          AppListControllerDelegate::PIN_EDITABLE;
 }
 
 void AppWindowLauncherItemController::OnWindowPropertyChanged(
     aura::Window* window,
     const void* key,
     intptr_t old) {
   if (key == aura::client::kDrawAttentionKey) {
@@ skipping 31 matching lines @@
   if (window_to_show->IsActive()) {
     // Coming here, only a single window is active. For keyboard activations
     // the window gets animated.
     AnimateWindow(window_to_show->GetNativeWindow(),
                   wm::WINDOW_ANIMATION_TYPE_BOUNCE);
   } else {
     return ShowAndActivateOrMinimize(window_to_show);
   }
   return kNoAction;
 }