Aura: Switch window mode when screen resolution changes

chrome/browser/ui/views/frame/opaque_browser_frame_view.cc

Index: chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
diff --git a/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc b/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
index c3fb4ed8432115fb435d5bb22b023b7f652b78d8..83e5fed50d0e2f4aeb3317b3ddb17eacd1ae85d8 100644
--- a/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
+++ b/chrome/browser/ui/views/frame/opaque_browser_frame_view.cc
@@ -978,8 +978,10 @@ void OpaqueBrowserFrameView::LayoutWindowControls() {
       }
       return;
     }
-    close_button_->SetVisible(true);
   }
+  // Aura can transition in and out of single-window mode, so be sure the
+  // close button is visible after the change.
+  close_button_->SetVisible(true);
 
   // When the window is restored, we show a maximized button; otherwise, we show
   // a restore button.