Use Titlebar instead of TitleBar consistently in panels code.

chrome/browser/ui/panels/panel_browser_window_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window_gtk.h"
 
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "ui/base/dragdrop/gtk_dnd_util.h"
 
@@ skipping 54 matching lines @@
   // detect the window edge for behavioral purposes.  The edge, if any,
   // is present only for visual aspects.
   return FALSE;
 }
 
 bool PanelBrowserWindowGtk::HandleTitleBarLeftMousePress(
     GdkEventButton* event,
     guint32 last_click_time,
     gfx::Point last_click_position) {
   // In theory we should never enter this function as we have a handler for
-  // button press on title bar where we handle this.  Not putting NOTREACHED()
-  // here because we don't want to crash if hit-testing for title bar in window
+  // button press on titlebar where we handle this.  Not putting NOTREACHED()
+  // here because we don't want to crash if hit-testing for titlebar in window
   // button press handler in BrowserWindowGtk is off by a pixel or two.
-  DLOG(WARNING) << "Hit-testing for title bar off by a pixel or two?";
+  DLOG(WARNING) << "Hit-testing for titlebar off by a pixel or two?";
   return TRUE;
 }
 
 void PanelBrowserWindowGtk::SaveWindowPosition() {
   // We don't save window position for panels as it's controlled by
   // PanelManager.
   return;
 }
 
 void PanelBrowserWindowGtk::SetGeometryHints() {
@@ skipping 26 matching lines @@
 
 void PanelBrowserWindowGtk::SetPanelBounds(const gfx::Rect& bounds) {
   SetBounds(bounds);
 }
 
 void PanelBrowserWindowGtk::OnPanelExpansionStateChanged(
     Panel::ExpansionState expansion_state) {
   NOTIMPLEMENTED();
 }
 
-bool PanelBrowserWindowGtk::ShouldBringUpPanelTitleBar(int mouse_x,
+bool PanelBrowserWindowGtk::ShouldBringUpPanelTitlebar(int mouse_x,
                                                        int mouse_y) const {
   NOTIMPLEMENTED();
   return false;
 }
 
 void PanelBrowserWindowGtk::ClosePanel() {
   Close();
 }
 
 void PanelBrowserWindowGtk::ActivatePanel() {
@@ skipping 247 matching lines @@
       GTK_DRAG_RESULT_USER_CANCELLED);
   MessageLoopForUI::current()->RunAllPending();
 }
 
 void NativePanelTestingGtk::FinishDragTitlebar() {
   panel_browser_window_gtk_->OnDragFailed(
       panel_browser_window_gtk_->drag_widget_, NULL,
       GTK_DRAG_RESULT_NO_TARGET);
   MessageLoopForUI::current()->RunAllPending();
 }