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

net/url_request/url_request_context_builder.cc

Index: net/url_request/url_request_context_builder.cc
diff --git a/net/url_request/url_request_context_builder.cc b/net/url_request/url_request_context_builder.cc
index 7940b04170f347b2d5c24ac3e7c0af5bf3f52d9b..ee35572375d45279847eb9919787830d302b8eaf 100644
--- a/net/url_request/url_request_context_builder.cc
+++ b/net/url_request/url_request_context_builder.cc
@@ -274,12 +274,12 @@ URLRequestContext* URLRequestContextBuilder::Build() {
     HttpCache::BackendFactory* http_cache_backend = NULL;
     if (http_cache_params_.type == HttpCacheParams::DISK) {
       context->StartCacheThread();
-      http_cache_backend =
-          new HttpCache::DefaultBackend(DISK_CACHE,
-                                        net::CACHE_BACKEND_DEFAULT,
-                                        http_cache_params_.path,
-                                        http_cache_params_.max_size,
-                                        context->cache_message_loop_proxy());
+      http_cache_backend = new HttpCache::DefaultBackend(
+          DISK_CACHE,
+          net::CACHE_BACKEND_DEFAULT,
+          http_cache_params_.path,
+          http_cache_params_.max_size,
+          context->cache_message_loop_proxy().get());
     } else {
       http_cache_backend =
           HttpCache::DefaultBackend::InMemory(http_cache_params_.max_size);