gpu: Use mojom API for recording log messages to the host.

content/browser/gpu/gpu_process_host_ui_shim.h

Index: content/browser/gpu/gpu_process_host_ui_shim.h
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.h b/content/browser/gpu/gpu_process_host_ui_shim.h
index c6fca58dbde62be02f08c7b5dcda907b887be5e5..68c1ea767234d7ca84e20027a596c53c0f9d719f 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.h
+++ b/content/browser/gpu/gpu_process_host_ui_shim.h
@@ -71,11 +71,6 @@ class GpuProcessHostUIShim : public IPC::Listener,
   explicit GpuProcessHostUIShim(int host_id);
   ~GpuProcessHostUIShim() override;
 
-  // Message handlers.
-  bool OnControlMessageReceived(const IPC::Message& message);
-  void OnLogMessage(int level, const std::string& header,
-      const std::string& message);
-
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
 };