Only support left/right maximizing at 50% width when the --ash-enable-alternate-caption-button

ash/wm/maximize_bubble_controller.cc

Index: ash/wm/maximize_bubble_controller.cc
diff --git a/ash/wm/maximize_bubble_controller.cc b/ash/wm/maximize_bubble_controller.cc
index ae108ca3baad97cbd901b15bbc75fd46a3089c2f..2a23c88bbec16009c2fcf16bdba1152b36b0cf11 100644
--- a/ash/wm/maximize_bubble_controller.cc
+++ b/ash/wm/maximize_bubble_controller.cc
@@ -204,16 +204,16 @@ class BubbleMouseWatcherHost: public views::MouseWatcherHost {
 
 // The class which creates and manages the bubble menu element.
 // It creates a 'bubble border' and the content accordingly.
-// Note: Since the SnapSizer will show animations on top of the maximize button
-// this menu gets created as a separate window and the SnapSizer will be
-// created underneath this window.
+// Note: Since the PhantomWindowController will show animations on top of the
+// maximize button this menu gets created as a separate window and the phantom
+// window will be created underneath this window.
 class MaximizeBubbleController::Bubble : public views::BubbleDelegateView,
                                          public views::MouseWatcherListener {
  public:
   explicit Bubble(MaximizeBubbleController* owner, int appearance_delay_ms_);
   virtual ~Bubble() {}
 
-  // The window of the menu under which the SnapSizer will get created.
+  // The window of the menu under which the phantom window will get created.
   aura::Window* GetBubbleWindow();
 
   // Overridden from views::BubbleDelegateView.