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 c62fb986fc210de9dc5a782fe754630b1a165d60..039b802f1f992ef1db678c40f3f6ca07579731f7 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -1060,11 +1060,11 @@ void HWNDMessageHandler::PostProcessActivateMessage(
   } else if (background_fullscreen_hack_) {
     // Restore the bounds of the window to fullscreen.
     DCHECK(fullscreen_handler_->fullscreen());
-    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;
   }
 }