Change the visual appearance of panel on GTK per new UI design.

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window_cocoa.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
@@ skipping 346 matching lines @@
       const gfx::Point& mouse_location, panel::ClickModifier modifier) OVERRIDE;
   virtual void ReleaseMouseButtonTitlebar(
       panel::ClickModifier modifier) OVERRIDE;
   virtual void DragTitlebar(const gfx::Point& mouse_location) OVERRIDE;
   virtual void CancelDragTitlebar() OVERRIDE;
   virtual void FinishDragTitlebar() OVERRIDE;
   virtual bool VerifyDrawingAttention() const OVERRIDE;
   virtual bool VerifyActiveState(bool is_active) OVERRIDE;
   virtual bool IsWindowSizeKnown() const OVERRIDE;
   virtual bool IsAnimatingBounds() const OVERRIDE;
-  virtual bool IsButtonVisible(TitlebarButtonType button_type) const OVERRIDE;
+  virtual bool IsButtonVisible(
+      panel::TitlebarButtonType button_type) const OVERRIDE;
 
  private:
   PanelTitlebarViewCocoa* titlebar() const;
   // Weak, assumed always to outlive this test API object.
   PanelBrowserWindowCocoa* native_panel_window_;
 };
 
 // static
 NativePanelTesting* NativePanelTesting::Create(NativePanel* native_panel) {
   return new NativePanelTestingCocoa(native_panel);
@@ skipping 53 matching lines @@
 
 bool NativePanelTestingCocoa::IsWindowSizeKnown() const {
   return true;
 }
 
 bool NativePanelTestingCocoa::IsAnimatingBounds() const {
   return [native_panel_window_->controller_ isAnimatingBounds];
 }
 
 bool NativePanelTestingCocoa::IsButtonVisible(
-    TitlebarButtonType button_type) const {
+    panel::TitlebarButtonType button_type) const {
   switch (button_type) {
-    case CLOSE_BUTTON:
+    case panel::CLOSE_BUTTON:
       return ![[titlebar() closeButton] isHidden];
-    case MINIMIZE_BUTTON:
+    case panel::MINIMIZE_BUTTON:
       return ![[titlebar() minimizeButton] isHidden];
-    case RESTORE_BUTTON:
+    case panel::RESTORE_BUTTON:
       return ![[titlebar() restoreButton] isHidden];
     default:
       NOTREACHED();
   }
   return false;
 }