Avoid GpuPreferences exposed in content public gpu interface

content/common/gpu/media/gpu_video_decode_accelerator.cc

Index: content/common/gpu/media/gpu_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/gpu_video_decode_accelerator.cc b/content/common/gpu/media/gpu_video_decode_accelerator.cc
index cc50774fc8a4fd5aea7517e72617b6b4b4783064..18a0acb71490c98416055d538581e8b154400857 100644
--- a/content/common/gpu/media/gpu_video_decode_accelerator.cc
+++ b/content/common/gpu/media/gpu_video_decode_accelerator.cc
@@ -183,10 +183,8 @@ GpuVideoDecodeAccelerator::~GpuVideoDecodeAccelerator() {
 
 // static
 gpu::VideoDecodeAcceleratorCapabilities
-GpuVideoDecodeAccelerator::GetCapabilities(
-    const gpu::GpuPreferences& gpu_preferences) {
-  return GpuVideoDecodeAcceleratorFactoryImpl::GetDecoderCapabilities(
-      gpu_preferences);
+GpuVideoDecodeAccelerator::GetCapabilities() {
+  return GpuVideoDecodeAcceleratorFactoryImpl::GetDecoderCapabilities();
 }
 
 bool GpuVideoDecodeAccelerator::OnMessageReceived(const IPC::Message& msg) {
@@ -353,10 +351,7 @@ bool GpuVideoDecodeAccelerator::Initialize(
     return false;
   }
 
-  const gpu::GpuPreferences& gpu_preferences =
-      stub_->channel()->gpu_channel_manager()->gpu_preferences();
-  video_decode_accelerator_ =
-      vda_factory->CreateVDA(this, config, gpu_preferences);
+  video_decode_accelerator_ = vda_factory->CreateVDA(this, config);
   if (!video_decode_accelerator_) {
     LOG(ERROR) << "HW video decode not available for profile " << config.profile
                << (config.is_encrypted ? " with encryption" : "");