Fix content/shell including internals of content for service worker test.

content/common/mojo/service_registry_impl.cc

Index: content/common/mojo/service_registry_impl.cc
diff --git a/content/common/mojo/service_registry_impl.cc b/content/common/mojo/service_registry_impl.cc
index fe41cf7ba79a7a0cf2d331de527d68fe3acd484b..efc3298a0a33517c2f18901c1426b973cf023677 100644
--- a/content/common/mojo/service_registry_impl.cc
+++ b/content/common/mojo/service_registry_impl.cc
@@ -10,6 +10,10 @@
 
 namespace content {
 
+ServiceRegistry* ServiceRegistry::Create() {
+  return new ServiceRegistryImpl;
+}
+
 ServiceRegistryImpl::ServiceRegistryImpl()
     : binding_(this), weak_factory_(this) {}