content: Disable impl-side painting on Windows.

BUG=

Review URL: https://codereview.chromium.org/286333006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271567 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/gpu/compositor_util.cc

@@ -204,7 +204,7 @@ bool IsImplSidePaintingEnabled() {
       switches::kEnableBleedingEdgeRenderingFastPaths))
     return true;
 
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) || defined(OS_WIN)
   return false;
 #else
   return IsThreadedCompositingEnabled();