Manual fixups for scoped_refptr operator T* removal in base/

base/test/thread_test_helper.h

Index: base/test/thread_test_helper.h
diff --git a/base/test/thread_test_helper.h b/base/test/thread_test_helper.h
index 9521de60bfa774affd31ce3f3f478e21860c120c..f6817b520ed3bc57844ca17015887d6f382aa273 100644
--- a/base/test/thread_test_helper.h
+++ b/base/test/thread_test_helper.h
@@ -18,7 +18,8 @@ namespace base {
 // until all pending tasks on a given thread have been executed.
 class ThreadTestHelper : public RefCountedThreadSafe<ThreadTestHelper> {
  public:
-  explicit ThreadTestHelper(MessageLoopProxy* target_thread);
+  explicit ThreadTestHelper(
+      const scoped_refptr<MessageLoopProxy>& target_thread);
 
   // True if RunTest() was successfully executed on the target thread.
   bool Run() WARN_UNUSED_RESULT;