Remove base::ScopedPtrHashMap from media/.

media/gpu/ipc/service/media_gpu_channel_manager.cc

Index: media/gpu/ipc/service/media_gpu_channel_manager.cc
diff --git a/media/gpu/ipc/service/media_gpu_channel_manager.cc b/media/gpu/ipc/service/media_gpu_channel_manager.cc
index 568723a9c4f2e12ccfe7b2d02e34b00c28f60868..684c05afc54282f0c7efe5c96a835fac1ac9a05f 100644
--- a/media/gpu/ipc/service/media_gpu_channel_manager.cc
+++ b/media/gpu/ipc/service/media_gpu_channel_manager.cc
@@ -29,7 +29,7 @@ void MediaGpuChannelManager::AddChannel(int32_t client_id) {
   std::unique_ptr<MediaGpuChannel> media_gpu_channel(
       new MediaGpuChannel(gpu_channel));
   gpu_channel->SetUnhandledMessageListener(media_gpu_channel.get());
-  media_gpu_channels_.set(client_id, std::move(media_gpu_channel));
+  media_gpu_channels_[client_id] = std::move(media_gpu_channel);
 }
 
 void MediaGpuChannelManager::RemoveChannel(int32_t client_id) {