Make browser windows override_redirect when dragging tabs.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
index 73e9e3e6fa7d4b15eb2c0516afe973292397b108..52f14f71e519586691d9d982aac6a9529b3a150b 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
@@ -85,6 +85,7 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // internal list of open windows.
   static void CleanUpWindowList(void (*func)(aura::Window* window));
 
+
  protected:
   // Overridden from DesktopWindowTreeHost:
   void Init(aura::Window* content_window,
@@ -161,6 +162,7 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   void SetCursorNative(gfx::NativeCursor cursor) override;
   void MoveCursorToNative(const gfx::Point& location) override;
   void OnCursorVisibilityChangedNative(bool show) override;
+  void RemapAsNormalWindow() override;
 
  private:
   friend class DesktopWindowTreeHostX11HighDPITest;