Move view_manager service implementation to //services

mojo/BUILD.gn

Index: mojo/BUILD.gn
diff --git a/mojo/BUILD.gn b/mojo/BUILD.gn
index a7b619c7e2fd3455c305deca8701107d30b3b788..79e199e5deeb4104022e6ca2f931646de67b2d88 100644
--- a/mojo/BUILD.gn
+++ b/mojo/BUILD.gn
@@ -96,10 +96,10 @@ group("tests") {
   if (use_aura) {
     deps += [
       "//mojo/services/public/cpp/view_manager/tests:mojo_view_manager_lib_unittests",
-      "//mojo/services/view_manager:view_manager_service_apptests",
-      "//mojo/services/view_manager:view_manager_service_unittests",
-      "//mojo/services/view_manager:view_manager_unittests",
       "//mojo/services/window_manager:window_manager_unittests",
+      "//services/view_manager:view_manager_service_apptests",
+      "//services/view_manager:view_manager_service_unittests",
+      "//services/view_manager:view_manager_unittests",
     ]
   }