Revert of content/common: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 5c878fca0727a22ca1f12424a63cdf1bc39fc2b6..b026052bbbe3b55b417936acd33350d5b313b2f4 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -385,8 +385,9 @@
     delay = 0;
   }
 
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-      FROM_HERE, base::Bind(&GpuCommandBufferStub::PollWork, AsWeakPtr()),
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::Bind(&GpuCommandBufferStub::PollWork, AsWeakPtr()),
       base::TimeDelta::FromMilliseconds(delay));
 }
 
@@ -830,7 +831,7 @@
     IPC::Message* reply_message) {
   TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnCreateVideoDecoder");
   GpuVideoDecodeAccelerator* decoder = new GpuVideoDecodeAccelerator(
-      decoder_route_id, this, channel_->io_task_runner());
+      decoder_route_id, this, channel_->io_message_loop());
   decoder->Initialize(profile, reply_message);
   // decoder is registered as a DestructionObserver of this stub and will
   // self-delete during destruction of this stub.