Update the maximize button when size constraints change.

ash/frame/custom_frame_view_ash.cc

Index: ash/frame/custom_frame_view_ash.cc
diff --git a/ash/frame/custom_frame_view_ash.cc b/ash/frame/custom_frame_view_ash.cc
index 39d756651f4e788bedcdc02397d25c93c17feb90..450015a32a3256d21b24c3845886d9bdcd4755b3 100644
--- a/ash/frame/custom_frame_view_ash.cc
+++ b/ash/frame/custom_frame_view_ash.cc
@@ -151,6 +151,8 @@ class CustomFrameViewAsh::HeaderView
 
   void UpdateAvatarIcon();
 
+  void SizeConstraintsChanged();
+
   // views::View:
   virtual void Layout() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
@@ -270,6 +272,12 @@ void CustomFrameViewAsh::HeaderView::UpdateAvatarIcon() {
   Layout();
 }
 
+void CustomFrameViewAsh::HeaderView::SizeConstraintsChanged() {
+  caption_button_container_->ResetWindowControls();
+  caption_button_container_->UpdateSizeButtonVisibility();
+  Layout();
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh::HeaderView, views::View overrides:
 
@@ -489,6 +497,10 @@ void CustomFrameViewAsh::UpdateWindowTitle() {
   header_view_->SchedulePaintForTitle();
 }
 
+void CustomFrameViewAsh::SizeConstraintsChanged() {
+  header_view_->SizeConstraintsChanged();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh, views::View overrides: