Add URLRequestJobFactories to URLRequestContexts without one.

sync/internal_api/public/http_bridge.h

Index: sync/internal_api/public/http_bridge.h
diff --git a/sync/internal_api/public/http_bridge.h b/sync/internal_api/public/http_bridge.h
index 145e36ff8aecae2d8c18b3e90397e1125d553300..3988c7c9c77d59e6cd777389b0b787e253bcdbd4 100644
--- a/sync/internal_api/public/http_bridge.h
+++ b/sync/internal_api/public/http_bridge.h
@@ -33,6 +33,7 @@ namespace net {
 class HttpResponseHeaders;
 class HttpUserAgentSettings;
 class URLFetcher;
+class URLRequestJobFactory;
 }
 
 namespace syncer {
@@ -72,6 +73,7 @@ class SYNC_EXPORT_PRIVATE HttpBridge
     net::URLRequestContext* const baseline_context_;
     const scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
     scoped_ptr<net::HttpUserAgentSettings> http_user_agent_settings_;
+    scoped_ptr<net::URLRequestJobFactory> job_factory_;
 
     DISALLOW_COPY_AND_ASSIGN(RequestContext);
   };