Separate Remote InterfaceProvider again, and add a new client lib type for it.

services/shell/public/cpp/tests/interface_registry_unittest.cc

Index: services/shell/public/cpp/tests/interface_registry_unittest.cc
diff --git a/services/shell/public/cpp/tests/interface_registry_unittest.cc b/services/shell/public/cpp/tests/interface_registry_unittest.cc
index 614248f4fe42cc7237c97f8ddce3a6720ba4c26b..fbe6804b35a9f3d3de70cf6076f961b1cc3204dc 100644
--- a/services/shell/public/cpp/tests/interface_registry_unittest.cc
+++ b/services/shell/public/cpp/tests/interface_registry_unittest.cc
@@ -42,7 +42,7 @@ TEST(InterfaceRegistryTest, Ownership) {
     InterfaceBinder* b = new TestBinder(&delete_count);
     InterfaceRegistry::TestApi test_api(registry.get());
     test_api.SetInterfaceBinderForName(b, "TC1");
-    test_api.RemoveInterfaceBinderForName("TC1");
+    registry->RemoveInterface("TC1");
     registry.reset();
     EXPECT_EQ(2, delete_count);
   }