Rework tree APIs to reflect Google style and more const-correctness....

chrome/browser/ui/views/tabs/tab_strip.h

 // Copyright (c) 2011 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_STRIP_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/timer.h"
@@ skipping 51 matching lines @@
   virtual void PrepareForCloseAt(int model_index);
   virtual void RemoveTabAt(int model_index);
   virtual void SelectTabAt(int old_model_index, int new_model_index);
   virtual void TabTitleChangedNotLoading(int model_index);
   virtual void StartHighlight(int model_index);
   virtual void StopAllHighlighting();
   virtual BaseTab* CreateTabForDragging();
 
   // views::View overrides:
   virtual void PaintChildren(gfx::Canvas* canvas);
-  virtual views::View* GetViewByID(int id) const;
+  virtual const views::View* GetViewByID(int id) const;
   virtual gfx::Size GetPreferredSize();
   // NOTE: the drag and drop methods are invoked from FrameView. This is done to
   // allow for a drop region that extends outside the bounds of the TabStrip.
   virtual void OnDragEntered(const views::DropTargetEvent& event);
   virtual int OnDragUpdated(const views::DropTargetEvent& event);
   virtual void OnDragExited();
   virtual int OnPerformDrop(const views::DropTargetEvent& event);
   virtual AccessibilityTypes::Role GetAccessibleRole();
   virtual views::View* GetViewForPoint(const gfx::Point& point);
   virtual void OnThemeChanged();
@@ skipping 187 matching lines @@
 
   // Used for stage 1 of new tab animation.
   base::OneShotTimer<TabStrip> new_tab_timer_;
 
   scoped_ptr<views::MouseWatcher> mouse_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStrip);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_