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

chrome/browser/ui/views/options/content_settings_window_view.cc

Index: chrome/browser/ui/views/options/content_settings_window_view.cc
===================================================================
--- chrome/browser/ui/views/options/content_settings_window_view.cc	(revision 74231)
+++ chrome/browser/ui/views/options/content_settings_window_view.cc	(working copy)
@@ -129,7 +129,7 @@
                       listbox_width,
                       height() - (3 * kDialogPadding) - label_->height());
 
-  if (pages_[current_page_]->GetParent()) {
+  if (pages_[current_page_]->parent()) {
     pages_[current_page_]->SetBounds(
         2 * kDialogPadding + listbox_width,
         2 * kDialogPadding + label_->height(),
@@ -196,7 +196,7 @@
 }
 
 void ContentSettingsWindowView::ShowSettingsPage(int page) {
-  if (pages_[current_page_]->GetParent())
+  if (pages_[current_page_]->parent())
     RemoveChildView(pages_[current_page_]);
   current_page_ = page;
   AddChildView(pages_[current_page_]);