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

content/common/gpu/media/gpu_video_decode_accelerator.h

Index: content/common/gpu/media/gpu_video_decode_accelerator.h
diff --git a/content/common/gpu/media/gpu_video_decode_accelerator.h b/content/common/gpu/media/gpu_video_decode_accelerator.h
index cab2a2285cd346add4ea6ddbbfe3793a39fc05dc..85a46522b00f2cc6093e151cc80e137d1139f6cb 100644
--- a/content/common/gpu/media/gpu_video_decode_accelerator.h
+++ b/content/common/gpu/media/gpu_video_decode_accelerator.h
@@ -20,6 +20,10 @@
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace content {
 
 class GpuVideoDecodeAccelerator
@@ -34,7 +38,7 @@
   GpuVideoDecodeAccelerator(
       int32 host_route_id,
       GpuCommandBufferStub* stub,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+      const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
 
   // IPC::Listener implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
@@ -136,11 +140,11 @@
   // destroy the VDA.
   base::WaitableEvent filter_removed_;
 
-  // GPU child thread task runner.
-  const scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
+  // GPU child message loop.
+  const scoped_refptr<base::MessageLoopProxy> child_message_loop_;
 
-  // GPU IO thread task runner.
-  const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+  // GPU IO message loop.
+  const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   // Weak pointers will be invalidated on IO thread.
   base::WeakPtrFactory<Client> weak_factory_for_io_;