Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

net/disk_cache/stress_cache.cc

Index: net/disk_cache/stress_cache.cc
diff --git a/net/disk_cache/stress_cache.cc b/net/disk_cache/stress_cache.cc
index b4129ef751f3d49c283892b90b37c7909a8c77b3..ef257a7124de0583aa01392ebaec9fbd038e819b 100644
--- a/net/disk_cache/stress_cache.cc
+++ b/net/disk_cache/stress_cache.cc
@@ -111,9 +111,8 @@ void StressTheCache(int iteration) {
           base::Thread::Options(base::MessageLoop::TYPE_IO, 0)))
     return;
 
-  disk_cache::BackendImpl* cache =
-      new disk_cache::BackendImpl(path, mask, cache_thread.message_loop_proxy(),
-                                  NULL);
+  disk_cache::BackendImpl* cache = new disk_cache::BackendImpl(
+      path, mask, cache_thread.message_loop_proxy().get(), NULL);
   cache->SetMaxSize(cache_size);
   cache->SetFlags(disk_cache::kNoLoadProtection);