  #include "base/win/scoped_hdc.h"
  #include "base/win/wrapped_window_proc.h"
  #include "gpu/ipc/common/gpu_messages.h"
-@@ -21,49 +20,11 @@
+@@ -21,48 +20,10 @@
  
  namespace gpu {
  

removed after upgraded to Chrome 72.

diff --git a/gpu/ipc/service/child_window_win.cc b/gpu/ipc/service/child_window_win.cc
index d531234..3cce23e 100644
--- a/gpu/ipc/service/child_window_win.cc
+++ b/gpu/ipc/service/child_window_win.cc
@@ -9,7 +9,6 @@

   HWND parent_window_;
   HWND window_;
diff --git a/gpu/ipc/service/direct_composition_surface_win.cc b/gpu/ipc/service/direct_composition_surface_win.cc
index da05d806bfa7e8710833eec7a2d85dfaeb9ed37a..761384364cb2544bc984f391b7c433e12fae1c33 100644
--- a/gpu/ipc/service/direct_composition_surface_win.cc
+++ b/gpu/ipc/service/direct_composition_surface_win.cc
@@ -1573,8 +1573,6 @@ gfx::SwapResult DirectCompositionSurfaceWin::SwapBuffers(
   gl::GLSurfacePresentationHelper::ScopedSwapBuffers scoped_swap_buffers(
       presentation_helper_.get(), callback);
 
-  child_window_.ClearInvalidContents();
-
   bool succeeded = true;
 
   if (root_surface_->SwapBuffers(PresentationCallback()) ==
