Merge pull request #3756 from davidkline-ms/testfix

Fix test failure (core 04_09) related to requesting the wrong interface type

Author: wiwei

Assets/MixedRealityToolkit.Tests/EditModeTests/Core/TestFixture_01_MixedRealityToolkitTests.cs

@@ -283,7 +283,7 @@ public void Test_04_09_GetAllMixedRealityDataProviders()
             MixedRealityToolkit.Instance.RegisterService<ITestDataProvider2>(new TestDataProvider2(null, null, "Test16-2.2", 10));
 
             // Retrieve all extension services.
-            var allExtensionServices = MixedRealityToolkit.Instance.GetServices<IMixedRealityExtensionService>();
+            var allExtensionServices = MixedRealityToolkit.Instance.GetServices<IMixedRealityDataProvider>();
 
             // Tests
             Assert.AreEqual(4, allExtensionServices.Count);