Moved service_registry from services to mojo/services/service_registry

It needs to be in a conventional public location to be available to consumer repos.

R=tonyg@chromium.org

Review URL: https://codereview.chromium.org/968493004

viewer/BUILD.gn

@@ -44,9 +44,9 @@ mojo_native_application("viewer") {
     "//mojo/services/input_events/public/interfaces",
     "//mojo/services/navigation/public/interfaces",
     "//mojo/services/network/public/interfaces",
+    "//mojo/services/service_registry/public/interfaces",
     "//mojo/services/surfaces/public/interfaces",
     "//mojo/services/view_manager/public/cpp",
-    "//services/service_registry:bindings",
     "//skia",
     "//sky/compositor",
     "//sky/engine",

viewer/document_view.h

@@ -15,10 +15,10 @@
 #include "mojo/services/content_handler/public/interfaces/content_handler.mojom.h"
 #include "mojo/services/navigation/public/interfaces/navigation.mojom.h"
 #include "mojo/services/network/public/interfaces/url_loader.mojom.h"
+#include "mojo/services/service_registry/public/interfaces/service_registry.mojom.h"
 #include "mojo/services/view_manager/public/cpp/view_manager_client_factory.h"
 #include "mojo/services/view_manager/public/cpp/view_manager_delegate.h"
 #include "mojo/services/view_manager/public/cpp/view_observer.h"
-#include "services/service_registry/service_registry.mojom.h"
 #include "sky/compositor/layer_client.h"
 #include "sky/compositor/layer_host_client.h"
 #include "sky/engine/public/platform/ServiceProvider.h"