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

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

Index: chrome/browser/ui/views/options/simple_content_exceptions_view.cc
===================================================================
--- chrome/browser/ui/views/options/simple_content_exceptions_view.cc	(revision 74231)
+++ chrome/browser/ui/views/options/simple_content_exceptions_view.cc	(working copy)
@@ -70,7 +70,7 @@
 
   // The buttons are placed in the parent, but we need to lay them out.
   int max_y =
-      GetParent()->GetContentsBounds().bottom() - views::kButtonVEdgeMargin;
+      parent()->GetContentsBounds().bottom() - views::kButtonVEdgeMargin;
   int x = kPanelHorizMargin;
 
   for (size_t i = 0; i < arraysize(buttons); ++i) {
@@ -143,9 +143,8 @@
       UTF16ToWide(l10n_util::GetStringUTF16(IDS_EXCEPTIONS_REMOVEALL_BUTTON)));
   remove_all_button_->set_tag(IDS_EXCEPTIONS_REMOVEALL_BUTTON);
 
-  View* parent = GetParent();
-  parent->AddChildView(remove_button_);
-  parent->AddChildView(remove_all_button_);
+  parent()->AddChildView(remove_button_);
+  parent()->AddChildView(remove_all_button_);
 
   GridLayout* layout = new GridLayout(this);
   layout->SetInsets(kExceptionsViewInsetSize, kExceptionsViewInsetSize,