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

views/controls/native_control_gtk.cc

Index: views/controls/native_control_gtk.cc
===================================================================
--- views/controls/native_control_gtk.cc	(revision 74231)
+++ views/controls/native_control_gtk.cc	(working copy)
@@ -67,13 +67,13 @@
   DCHECK(native_view());
   gtk_widget_grab_focus(native_view());
 
-  GetParent()->NotifyAccessibilityEvent(AccessibilityTypes::EVENT_FOCUS);
+  parent()->NotifyAccessibilityEvent(AccessibilityTypes::EVENT_FOCUS);
 }
 
 void NativeControlGtk::NativeControlCreated(GtkWidget* native_control) {
   Attach(native_control);
 
-  // Update the newly created GtkWdigetwith any resident enabled state.
+  // Update the newly created GtkWidget with any resident enabled state.
   gtk_widget_set_sensitive(native_view(), IsEnabled());
 
   // Listen for focus change event to update the FocusManager focused view.