Use a utility process for the Mojo v8 proxy resolver.

content/public/utility/content_utility_client.h

Index: content/public/utility/content_utility_client.h
diff --git a/content/public/utility/content_utility_client.h b/content/public/utility/content_utility_client.h
index 5a5d0e54e785ab7cc587c782a1214d78989273cb..8a333e7ed7dbdfdf468d1a1c87367db2a0830bd7 100644
--- a/content/public/utility/content_utility_client.h
+++ b/content/public/utility/content_utility_client.h
@@ -9,6 +9,8 @@
 
 namespace content {
 
+class ServiceRegistry;
+
 // Embedder API for participating in renderer logic.
 class CONTENT_EXPORT ContentUtilityClient {
  public:
@@ -19,6 +21,9 @@ class CONTENT_EXPORT ContentUtilityClient {
 
   // Allows the embedder to filter messages.
   virtual bool OnMessageReceived(const IPC::Message& message);
+
+  // Registers Mojo services.
+  virtual void RegisterMojoServices(ServiceRegistry* registry) {}
 };
 
 }  // namespace content