Fixes focus traversal bug

ui/views/focus/focus_manager.h

Index: ui/views/focus/focus_manager.h
diff --git a/ui/views/focus/focus_manager.h b/ui/views/focus/focus_manager.h
index 6a17fc2bc1a00e8174cc637f787efecdf6ba9d53..be254133826232a308fb82e9992a5fa4da1c8273 100644
--- a/ui/views/focus/focus_manager.h
+++ b/ui/views/focus/focus_manager.h
@@ -308,8 +308,16 @@ class VIEWS_EXPORT FocusManager {
   }
 
  private:
-  // Returns the next focusable view.
-  View* GetNextFocusableView(View* starting_view, bool reverse, bool dont_loop);
+  // Returns the next focusable view. Traversal starts at |starting_view|. If
+  // |starting_view| is NULL |starting_widget| is consuled to determine which
+  // Widget to start from. See
+  // WidgetDelegate::ShouldAdvanceFocusToTopLevelWidget() for details. If both
+  // |starting_view| and |starting_widget| are NULL, traversal starts at
+  // |widget_|.
+  View* GetNextFocusableView(View* starting_view,
+                             Widget* starting_widget,
+                             bool reverse,
+                             bool dont_loop);
 
   // Returns the focusable view found in the FocusTraversable specified starting
   // at the specified view. This traverses down along the FocusTraversable