Remove "Alternate frame caption button style" command line flag

ash/frame/caption_buttons/frame_caption_button_container_view.h

Index: ash/frame/caption_buttons/frame_caption_button_container_view.h
diff --git a/ash/frame/caption_buttons/frame_caption_button_container_view.h b/ash/frame/caption_buttons/frame_caption_button_container_view.h
index d50350e038bb5a6816ff80704b9be8ec1a4326b7..31a85426aaec8f6327ec1f0d87aa76f6ba74d7d5 100644
--- a/ash/frame/caption_buttons/frame_caption_button_container_view.h
+++ b/ash/frame/caption_buttons/frame_caption_button_container_view.h
@@ -16,7 +16,6 @@ class Widget;
 
 namespace ash {
 class FrameCaptionButton;
-class FrameMaximizeButton;
 
 // Container view for the frame caption buttons. It performs the appropriate
 // action when a caption button is clicked.
@@ -66,10 +65,6 @@ class ASH_EXPORT FrameCaptionButtonContainerView
     DISALLOW_COPY_AND_ASSIGN(TestApi);
   };
 
-  // Returns the size button if using the old caption button style, returns NULL
-  // otherwise.
-  FrameMaximizeButton* GetOldStyleSizeButton();
-
   // Sets the resource ids of the images to paint the button for |icon|. The
   // FrameCaptionButtonContainerView will keep track of the images to use for
   // |icon| even if none of the buttons currently use |icon|.