Revert of Make lost context and error message callbacks on GpuControl go to client

mojo/gles2/command_buffer_client_impl.h

Index: mojo/gles2/command_buffer_client_impl.h
diff --git a/mojo/gles2/command_buffer_client_impl.h b/mojo/gles2/command_buffer_client_impl.h
index a546023621144e0e52055afa025a0057808bd25f..995ff1c9511950c73155eb23800a3f548585176e 100644
--- a/mojo/gles2/command_buffer_client_impl.h
+++ b/mojo/gles2/command_buffer_client_impl.h
@@ -27,12 +27,19 @@
 namespace gles2 {
 class CommandBufferClientImpl;
 
+class CommandBufferDelegate {
+ public:
+  virtual ~CommandBufferDelegate();
+  virtual void ContextLost();
+};
+
 class CommandBufferClientImpl
     : public mus::mojom::CommandBufferClient,
       public gpu::CommandBuffer,
       public gpu::GpuControl {
  public:
   explicit CommandBufferClientImpl(
+      CommandBufferDelegate* delegate,
       const std::vector<int32_t>& attribs,
       mojo::ScopedMessagePipeHandle command_buffer_handle);
   ~CommandBufferClientImpl() override;
@@ -51,7 +58,6 @@
   void DestroyTransferBuffer(int32_t id) override;
 
   // gpu::GpuControl implementation:
-  void SetGpuControlClient(gpu::GpuControlClient*) override;
   gpu::Capabilities GetCapabilities() override;
   int32_t CreateImage(ClientBuffer buffer,
                       size_t width,
@@ -90,8 +96,7 @@
 
   gpu::CommandBufferSharedState* shared_state() const { return shared_state_; }
 
-  gpu::GpuControlClient* gpu_control_client_;
-  bool destroyed_;
+  CommandBufferDelegate* delegate_;
   std::vector<int32_t> attribs_;
   mojo::Binding<mus::mojom::CommandBufferClient> client_binding_;
   mus::mojom::CommandBufferPtr command_buffer_;