Update the maximize button when size constraints change.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
 // Get rid of X11 macros which conflict with gtest.
@@ skipping 98 matching lines @@
     window_mask->lineTo(right - 10, 10);
     window_mask->lineTo(right - 10, 0);
     window_mask->close();
   }
   virtual void ResetWindowControls() OVERRIDE {
   }
   virtual void UpdateWindowIcon() OVERRIDE {
   }
   virtual void UpdateWindowTitle() OVERRIDE {
   }
+  virtual void SizeConstraintsChanged() OVERRIDE {
+  }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShapedNonClientFrameView);
 };
 
 class ShapedWidgetDelegate : public WidgetDelegateView {
  public:
   ShapedWidgetDelegate() {
   }
 
@@ skipping 321 matching lines @@
         SubstructureRedirectMask | SubstructureNotifyMask,
         &xevent);
 
     WMStateWaiter waiter(xid, "_NET_WM_STATE_FOCUSED", true);
     waiter.Wait();
   }
   EXPECT_TRUE(widget.GetNativeWindow()->IsVisible());
 }
 
 }  // namespace views