Remove the non-const browser() getter from BrowserWindowGtk.

chrome/browser/gtk/browser_window_gtk.h

 // Copyright (c) 2009 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_GTK_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_GTK_BROWSER_WINDOW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <map>
@@ skipping 36 matching lines @@
 // it needs to manipulate the window.
 
 class BrowserWindowGtk : public BrowserWindow,
                          public NotificationObserver,
                          public TabStripModelObserver,
                          public ActiveWindowWatcherX::Observer {
  public:
   explicit BrowserWindowGtk(Browser* browser);
   virtual ~BrowserWindowGtk();
 
-  Browser* browser() const { return browser_.get(); }
-
   // Process a keyboard event which was not handled by webkit.
   bool HandleKeyboardEvent(GdkEventKey* event);
 
   // Overridden from BrowserWindow
   virtual void Show();
   virtual void SetBounds(const gfx::Rect& bounds);
   virtual void Close();
   virtual void Activate();
   virtual bool IsActive() const;
   virtual void FlashFrame();
@@ skipping 116 matching lines @@
   void ResetCustomFrameCursor();
 
   // Returns the BrowserWindowGtk registered with |window|.
   static BrowserWindowGtk* GetBrowserWindowForNativeWindow(
       gfx::NativeWindow window);
 
   // Retrieves the GtkWindow associated with |xid|, which is the X Window
   // ID of the top-level X window of this object.
   static GtkWindow* GetBrowserWindowForXID(XID xid);
 
-  Browser* browser() {
-    return browser_.get();
-  }
+  Browser* browser() const { return browser_.get(); }
 
   GtkWindow* window() const { return window_; }
 
   gfx::Rect bounds() const { return bounds_; }
 
   // Make changes necessary when the floating state of the bookmark bar changes.
   // This should only be called by the bookmark bar itself.
   void BookmarkBarIsFloating(bool is_floating);
 
   static void RegisterUserPrefs(PrefService* prefs);
@@ skipping 216 matching lines @@
   // first time.  This is to work around a compiz bug.
   bool maximize_after_show_;
 
   // The accelerator group used to handle accelerators, owned by this object.
   GtkAccelGroup* accel_group_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_WINDOW_GTK_H_