Fix Mac resize, delete more Mac code

content/renderer/pepper/pepper_video_encoder_host.cc

Index: content/renderer/pepper/pepper_video_encoder_host.cc
diff --git a/content/renderer/pepper/pepper_video_encoder_host.cc b/content/renderer/pepper/pepper_video_encoder_host.cc
index 617b7d282434b37ace026501f82386d751bb0eea..ee8f8dc7a9ff1915e0f451c728952a7d5f02a2b4 100644
--- a/content/renderer/pepper/pepper_video_encoder_host.cc
+++ b/content/renderer/pepper/pepper_video_encoder_host.cc
@@ -529,7 +529,7 @@ bool PepperVideoEncoderHost::EnsureGpuChannel() {
   command_buffer_ = channel->CreateCommandBuffer(
       gpu::kNullSurfaceHandle, gfx::Size(), nullptr, gpu::GPU_STREAM_DEFAULT,
       gpu::GpuStreamPriority::NORMAL, attribs, GURL::EmptyGURL(),
-      gfx::PreferIntegratedGpu);
+      gfx::PreferIntegratedGpu, base::ThreadTaskRunnerHandle::Get());
   if (!command_buffer_) {
     Close();
     return false;