Update the maximize button when size constraints change.

ui/views/window/non_client_view.h

Index: ui/views/window/non_client_view.h
diff --git a/ui/views/window/non_client_view.h b/ui/views/window/non_client_view.h
index 721097c6ce1124eb20eea23ac18af99d1fb944a3..0ddc5f65a543e87476a5d9d6ea489955843979ba 100644
--- a/ui/views/window/non_client_view.h
+++ b/ui/views/window/non_client_view.h
@@ -79,6 +79,7 @@ class VIEWS_EXPORT NonClientFrameView : public View,
   virtual void ResetWindowControls() = 0;
   virtual void UpdateWindowIcon() = 0;
   virtual void UpdateWindowTitle() = 0;
+  virtual void SizeConstraintsChanged() = 0;
 
   // View:
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
@@ -195,6 +196,9 @@ class VIEWS_EXPORT NonClientView : public View, public ViewTargeterDelegate {
   // title.
   void UpdateWindowTitle();
 
+  // Called when the size constraints of the window change.
+  void SizeConstraintsChanged();
+
   // Get/Set client_view property.
   ClientView* client_view() const { return client_view_; }
   void set_client_view(ClientView* client_view) {