Convert some more view methods to the ui/views style.

chrome/browser/ui/views/frame/browser_frame_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/views/frame/browser_frame_gtk.h"
 
 #include "base/logging.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
@@ skipping 35 matching lines @@
 }
 
 int BrowserFrameGtk::GetMinimizeButtonOffset() const {
   NOTIMPLEMENTED();
   return 0;
 }
 
 void BrowserFrameGtk::TabStripDisplayModeChanged() {
   if (GetWidget()->GetRootView()->has_children()) {
     // Make sure the child of the root view gets Layout again.
-    GetWidget()->GetRootView()->GetChildViewAt(0)->InvalidateLayout();
+    GetWidget()->GetRootView()->child_at(0)->InvalidateLayout();
   }
   GetWidget()->GetRootView()->Layout();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserFrameGtk, NativeWidgetGtk overrides:
 
 gboolean BrowserFrameGtk::OnWindowStateEvent(GtkWidget* widget,
                                              GdkEventWindowState* event) {
   bool was_full_screen = IsFullscreen();
@@ skipping 21 matching lines @@
 
 // static
 NativeBrowserFrame* NativeBrowserFrame::CreateNativeBrowserFrame(
     BrowserFrame* browser_frame,
     BrowserView* browser_view) {
   if (views::Widget::IsPureViews() &&
       views::ViewsDelegate::views_delegate->GetDefaultParentView())
     return new BrowserFrameViews(browser_frame, browser_view);
   return new BrowserFrameGtk(browser_frame, browser_view);
 }