Fix a painting bug which occurred due to the change which reduces the size of the fullscreen chrome…

ui/views/win/hwnd_message_handler.cc

Index: ui/views/win/hwnd_message_handler.cc
diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
index 7efa0a51c94b13bc9bfff7028a2c8ce05e995306..531b4881a52f56d1dfe62604a6999364b81b6fd9 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -1043,11 +1043,11 @@ void HWNDMessageHandler::PostProcessActivateMessage(
   } else if (background_fullscreen_hack_) {
     // Restore the bounds of the window to fullscreen.
     DCHECK(IsFullscreen());
-    background_fullscreen_hack_ = false;
     MONITORINFO monitor_info = {sizeof(monitor_info)};
     GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY),
                    &monitor_info);
     SetBoundsInternal(gfx::Rect(monitor_info.rcMonitor), false);
+    background_fullscreen_hack_ = false;
   }
 }