Remove unused field from WebContentsViewAura and add comment as to why

content/browser/web_contents/web_contents_view_aura.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 105 matching lines @@
   virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual ui::TouchStatus OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // Overridden from aura::client::DragDropDelegate:
   virtual void OnDragEntered(const ui::DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const ui::DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
   virtual int OnPerformDrop(const ui::DropTargetEvent& event) OVERRIDE;
 
-  gfx::Size initial_size_;
-
   scoped_ptr<aura::Window> window_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   content::RenderWidgetHostView* view_;
 
   scoped_ptr<content::WebContentsViewDelegate> delegate_;
 
   WebKit::WebDragOperationsMask current_drag_op_;
 
   // Set to true if we want to close the tab after the system drag operation
   // has finished.
   bool close_tab_after_drag_ends_;
 
   content::WebDragDestDelegate* drag_dest_delegate_;
 
   // We keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.  WARNING:
   // this pointer should never be dereferenced.  We only use it for comparing
   // pointers.
   void* current_rvh_for_drag_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_