Support painting panels with chromium themes on GTK.

chrome/browser/ui/panels/panel_window_controller_cocoa.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_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 
 // A class acting as the Objective-C controller for the Panel window
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single titlebar and is managed/owned by Panel.
@@ skipping 121 matching lines @@
 // See Panel::FullScreenModeChanged.
 - (void)fullScreenModeChanged:(bool)isFullScreen;
 
 // Helper for NSWindow, returns NO for minimized panels in some cases, so they
 // are not un-minimized when another panel is minimized.
 - (BOOL)canBecomeKeyWindow;
 
 // Returns true if browser window requested activation of the window.
 - (BOOL)activationRequestedByBrowser;
 
-// Returns width of titlebar when shown in "icon only" mode.
-- (int)titlebarIconOnlyWidthInScreenCoordinates;
-
 - (void)ensureFullyVisible;
 
 - (void)updateWindowLevel;
 
 // Turns on user-resizable corners/sides indications and enables live resize.
 - (void)enableResizeByMouse:(BOOL)enable;
 
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_