Revert of content: Fix single process support for native GpuMemoryBuffers.

content/gpu/gpu_child_thread.h

Index: content/gpu/gpu_child_thread.h
diff --git a/content/gpu/gpu_child_thread.h b/content/gpu/gpu_child_thread.h
index a9ed8b956c665d0be7fe80ab72fbc330233be654..3993e51e627f8a3bea7688143efb9b4d66657719 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -44,12 +44,9 @@
                  const DeferredMessages& deferred_messages,
                  GpuMemoryBufferFactory* gpu_memory_buffer_factory);
 
-  GpuChildThread(const InProcessChildThreadParams& params,
-                 GpuMemoryBufferFactory* gpu_memory_buffer_factory);
+  explicit GpuChildThread(const InProcessChildThreadParams& params);
 
   ~GpuChildThread() override;
-
-  static gfx::GpuMemoryBufferType GetGpuMemoryBufferFactoryType();
 
   void Shutdown() override;