Fix a crash in gl::DirectCompositionSurfaceWin::Destroy

if DirectCompositionSurfaceWin::Initialize() fails before dcomp_device_
is created. It will cause access violation at dcomp_device_->Commit() in
DirectCompositionSurfaceWin::Destroy()/ ~DirectCompositionSurfaceWin();

Bug: 1088408
Change-Id: I57c07599b2bb5f6f42e48128c25d4f74da65ff8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225328Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773778}

ui/gl/direct_composition_surface_win.cc

@@ -608,7 +608,8 @@ void DirectCompositionSurfaceWin::Destroy() {
   // that if DWM.exe crashes, the Chromium window will become black until
   // the next Commit.
   layer_tree_.reset();
-  dcomp_device_->Commit();
+  if (dcomp_device_)
+    dcomp_device_->Commit();
 }
 
 gfx::Size DirectCompositionSurfaceWin::GetSize() {