Use Titlebar instead of TitleBar consistently in panels code.

chrome/browser/ui/panels/panel_browser_window_gtk.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_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
 #include "chrome/browser/ui/panels/native_panel.h"
 
@@ skipping 26 matching lines @@
   virtual void SetGeometryHints() OVERRIDE;
   virtual bool UseCustomFrame() OVERRIDE;
 
   // Overridden from NativePanel:
   virtual void ShowPanel() OVERRIDE;
   virtual void ShowPanelInactive() OVERRIDE;
   virtual gfx::Rect GetPanelBounds() const OVERRIDE;
   virtual void SetPanelBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual void OnPanelExpansionStateChanged(
       Panel::ExpansionState expansion_state) OVERRIDE;
-  virtual bool ShouldBringUpPanelTitleBar(int mouse_x,
+  virtual bool ShouldBringUpPanelTitlebar(int mouse_x,
                                           int mouse_y) const OVERRIDE;
   virtual void ClosePanel() OVERRIDE;
   virtual void ActivatePanel() OVERRIDE;
   virtual void DeactivatePanel() OVERRIDE;
   virtual bool IsPanelActive() const OVERRIDE;
   virtual gfx::NativeWindow GetNativePanelHandle() OVERRIDE;
   virtual void UpdatePanelTitleBar() OVERRIDE;
   virtual void ShowTaskManagerForPanel() OVERRIDE;
   virtual FindBar* CreatePanelFindBar() OVERRIDE;
   virtual void NotifyPanelOnUserChangedTheme() OVERRIDE;
@@ skipping 55 matching lines @@
   // a task to end the drag and only run it if GTK+ didn't send us the
   // drag-failed event.
   ScopedRunnableMethodFactory<PanelBrowserWindowGtk> drag_end_factory_;
 
   scoped_ptr<Panel> panel_;
   gfx::Rect bounds_;
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_