Fixes couple of bugs in the TabStrip that could cause tabs to dance

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 481 matching lines @@
   // operation. This is used to calculate minimum elasticity before a
   // DraggedTabView is constructed.
   gfx::Point start_point_in_screen_;
 
   // This is the offset of the mouse from the top left of the Tab where
   // dragging begun. This is used to ensure that the dragged view is always
   // positioned at the correct location during the drag, and to ensure that the
   // detached window is created at the right location.
   gfx::Point mouse_offset_;
 
-  // Offset of the mouse relative to the source tab.
-  int source_tab_offset_;
-
-  // Ratio of the x-coordinate of the |source_tab_offset_| to the width of the
+  // Ratio of the x-coordinate of the |source_tab_offset| to the width of the
   // tab. Not used for vertical tabs.
   float offset_to_width_ratio_;
 
   // A hint to use when positioning new windows created by detaching Tabs. This
   // is the distance of the mouse from the top left of the dragged tab as if it
   // were the distance of the mouse from the top left of the first tab in the
   // attached TabStrip from the top left of the window.
   gfx::Point window_create_point_;
 
   // Location of the first tab in the source tabstrip in screen coordinates.
@@ skipping 87 matching lines @@
   // If non-null set to true from destructor.
   bool* destroyed_;
 
   // See description above getter.
   bool is_mutating_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_