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

chrome/browser/web_resource/json_asynchronous_unpacker.cc

Index: chrome/browser/web_resource/json_asynchronous_unpacker.cc
diff --git a/chrome/browser/web_resource/json_asynchronous_unpacker.cc b/chrome/browser/web_resource/json_asynchronous_unpacker.cc
index 441c864b5efc22e6681d56e0eaae042396583115..8eee8aa21654dc038eaad11189a5424eee212905 100644
--- a/chrome/browser/web_resource/json_asynchronous_unpacker.cc
+++ b/chrome/browser/web_resource/json_asynchronous_unpacker.cc
@@ -106,7 +106,7 @@ class JSONAsynchronousUnpackerImpl
   void StartProcessOnIOThread(BrowserThread::ID thread_id,
                               const std::string& json_data) {
     UtilityProcessHost* host = UtilityProcessHost::Create(
-        this, BrowserThread::GetMessageLoopProxyForThread(thread_id));
+        this, BrowserThread::GetMessageLoopProxyForThread(thread_id).get());
     host->EnableZygote();
     // TODO(mrc): get proper file path when we start using web resources
     // that need to be unpacked.