Manual fixups in remoting/ for scoped_refptr operator T* removal.

BUG=110610

Review URL: https://codereview.chromium.org/511313002

Cr-Commit-Position: refs/heads/master@{#292467}
diff --git a/remoting/client/client_context.h b/remoting/client/client_context.h
index 19c36f3..7568387a 100644
--- a/remoting/client/client_context.h
+++ b/remoting/client/client_context.h
@@ -21,7 +21,8 @@
  public:
   // |main_task_runner| is the task runner for the main plugin thread
   // that is used for all PPAPI calls, e.g. network and graphics.
-  ClientContext(base::SingleThreadTaskRunner* main_task_runner);
+  ClientContext(
+      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner);
   virtual ~ClientContext();
 
   void Start();