Revert of Enable DirectComposition by default.

content/browser/gpu/gpu_data_manager_impl_private.cc

Index: content/browser/gpu/gpu_data_manager_impl_private.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private.cc b/content/browser/gpu/gpu_data_manager_impl_private.cc
index 5a639c87381726c4ab536c9ed2d045abd7babdf2..bb8e0337f57c2a20f0e9ca5e00961204f1f58e62 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private.cc
@@ -659,9 +659,6 @@
           switches::kSwiftShaderPath);
   if (gpu_driver_bugs_.find(gpu::DISABLE_D3D11) != gpu_driver_bugs_.end())
     command_line->AppendSwitch(switches::kDisableD3D11);
-  if (gpu_driver_bugs_.find(gpu::DISABLE_DIRECT_COMPOSITION) !=
-      gpu_driver_bugs_.end())
-    command_line->AppendSwitch(switches::kDisableDirectComposition);
   if (use_swiftshader_) {
     command_line->AppendSwitchASCII(switches::kUseGL, "swiftshader");
     if (swiftshader_path.empty())