Avoid GpuPreferences exposed in content public gpu interface

content/public/gpu/gpu_video_decode_accelerator_factory.cc

Index: content/public/gpu/gpu_video_decode_accelerator_factory.cc
diff --git a/content/public/gpu/gpu_video_decode_accelerator_factory.cc b/content/public/gpu/gpu_video_decode_accelerator_factory.cc
index 57b46a86f10ae50e182fcc7dd1e7744deabe40dd..a465b1761267925acbbfe390060cb34ac2718e13 100644
--- a/content/public/gpu/gpu_video_decode_accelerator_factory.cc
+++ b/content/public/gpu/gpu_video_decode_accelerator_factory.cc
@@ -44,21 +44,18 @@ GpuVideoDecodeAcceleratorFactory::CreateWithGLES2Decoder(
 
 // static
 gpu::VideoDecodeAcceleratorCapabilities
-GpuVideoDecodeAcceleratorFactory::GetDecoderCapabilities(
-    const gpu::GpuPreferences& gpu_preferences) {
-  return GpuVideoDecodeAcceleratorFactoryImpl::GetDecoderCapabilities(
-      gpu_preferences);
+GpuVideoDecodeAcceleratorFactory::GetDecoderCapabilities() {
+  return GpuVideoDecodeAcceleratorFactoryImpl::GetDecoderCapabilities();
 }
 
 scoped_ptr<media::VideoDecodeAccelerator>
 GpuVideoDecodeAcceleratorFactory::CreateVDA(
     media::VideoDecodeAccelerator::Client* client,
-    const media::VideoDecodeAccelerator::Config& config,
-    const gpu::GpuPreferences& gpu_preferences) {
+    const media::VideoDecodeAccelerator::Config& config) {
   if (!gvdafactory_impl_)
     return nullptr;
 
-  return gvdafactory_impl_->CreateVDA(client, config, gpu_preferences);
+  return gvdafactory_impl_->CreateVDA(client, config);
 }
 
 GpuVideoDecodeAcceleratorFactory::GpuVideoDecodeAcceleratorFactory(