Create ContentUtilityClient in single-process mode.

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
===================================================================
--- content/app/content_main_runner.cc	(revision 210625)
+++ content/app/content_main_runner.cc	(working copy)
@@ -307,7 +307,11 @@
         content_client->renderer_ = delegate->CreateContentRendererClient();
       if (!content_client->renderer_)
         content_client->renderer_ = &g_empty_content_renderer_client.Get();
-    } else if (process_type == switches::kUtilityProcess) {
+    }
+
+    if (process_type == switches::kUtilityProcess ||
+        CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kSingleProcess)) {
       if (delegate)
         content_client->utility_ = delegate->CreateContentUtilityClient();
       // TODO(scottmg): http://crbug.com/237249 Should be in _child.