Remove more non-aura windows code.

chrome/browser/ui/views/tabs/tab_drag_controller.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 CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 31 matching lines @@
 // Drag() is invoked as the mouse is dragged. If the mouse is dragged far enough
 // TabDragController starts a drag session. The drag session is completed when
 // EndDrag() is invoked (or the TabDragController is destroyed).
 //
 // While dragging within a tab strip TabDragController sets the bounds of the
 // tabs (this is referred to as attached). When the user drags far enough such
 // that the tabs should be moved out of the tab strip two possible things
 // can happen (this state is referred to as detached):
 // . If |detach_into_browser_| is true then a new Browser is created and
 //   RunMoveLoop() is invoked on the Widget to drag the browser around. This is
-//   the default on aura.
+//   the default on aura except in Metro mode on Win 8.
 // . If |detach_into_browser_| is false a small representation of the active tab
 //   is created and that is dragged around. This mode does not run a nested
 //   message loop.
 class TabDragController : public content::WebContentsDelegate,
                           public content::NotificationObserver,
                           public base::MessageLoopForUI::Observer,
                           public views::WidgetObserver,
                           public TabStripModelObserver {
  public:
   enum DetachBehavior {
@@ skipping 44 matching lines @@
 
   // Returns true if there is a drag underway and the drag is attached to
   // |tab_strip|.
   // NOTE: this returns false if the TabDragController is in the process of
   // finishing the drag.
   static bool IsAttachedTo(const TabStrip* tab_strip);
 
   // Returns true if there is a drag underway.
   static bool IsActive();
 
-  // Used to determine whether the tab drag controller detaches dragged tabs
-  // into new browser windows while the drag is in process.
-  static bool ShouldDetachIntoNewBrowser();
-
   // Sets the move behavior. Has no effect if started_drag() is true.
   void SetMoveBehavior(MoveBehavior behavior);
   MoveBehavior move_behavior() const { return move_behavior_; }
 
   EventSource event_source() const { return event_source_; }
 
   // See description above fields for details on these.
   bool active() const { return active_; }
   const TabStrip* attached_tabstrip() const { return attached_tabstrip_; }
 
@@ skipping 524 matching lines @@
   // See comment around use for more details.
   int attach_x_;
   int attach_index_;
 
   base::WeakPtrFactory<TabDragController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_