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

chrome/browser/ui/views/about_chrome_view.cc

Index: chrome/browser/ui/views/about_chrome_view.cc
===================================================================
--- chrome/browser/ui/views/about_chrome_view.cc	(revision 74117)
+++ chrome/browser/ui/views/about_chrome_view.cc	(working copy)
@@ -392,7 +392,7 @@
 
   // Get the y-coordinate of our parent so we can position the text left of the
   // buttons at the bottom.
-  gfx::Rect parent_bounds = GetParent()->GetLocalBounds();
+  gfx::Rect parent_bounds = parent()->GetLocalBounds();
 
   sz = throbber_->GetPreferredSize();
   int throbber_topleft_x = kPanelHorizMargin;
@@ -429,8 +429,7 @@
                           sz.height());
 
   if (!accessible_view_helper_.get())
-    accessible_view_helper_.reset(
-        new AccessibleViewHelper(GetParent(), profile_));
+    accessible_view_helper_.reset(new AccessibleViewHelper(parent(), profile_));
 }
 
 
@@ -830,8 +829,7 @@
     throbber_->Stop();
 
   // We have updated controls on the parent, so we need to update its layout.
-  View* parent = GetParent();
-  parent->Layout();
+  parent()->Layout();
 
   // Check button may have appeared/disappeared. We cannot call this during
   // ViewHierarchyChanged because the |window()| pointer hasn't been set yet.