Rework tree APIs to reflect Google style and more const-correctness....

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/browser_theme_provider.h"
 #include "chrome/browser/ui/status_bubble.h"
@@ skipping 72 matching lines @@
 
 bool BrowserFrameGtk::AlwaysUseNativeFrame() const {
   return false;
 }
 
 views::View* BrowserFrameGtk::GetFrameView() const {
   return browser_frame_view_;
 }
 
 void BrowserFrameGtk::TabStripDisplayModeChanged() {
-  if (GetRootView()->GetChildViewCount() > 0) {
+  if (GetRootView()->has_children()) {
     // Make sure the child of the root view gets Layout again.
     GetRootView()->GetChildViewAt(0)->InvalidateLayout();
   }
   GetRootView()->Layout();
 }
 
 ThemeProvider* BrowserFrameGtk::GetThemeProvider() const {
   return profile_->GetThemeProvider();
 }
 
@@ skipping 34 matching lines @@
   if (was_full_screen != IsFullscreen())
     browser_view_->FullScreenStateChanged();
   return result;
 }
 
 gboolean BrowserFrameGtk::OnConfigureEvent(GtkWidget* widget,
                                            GdkEventConfigure* event) {
   browser_view_->WindowMoved();
   return views::WindowGtk::OnConfigureEvent(widget, event);
 }