Update OCMock to version 3.7.1 (#401)

This gets us to latest and fixes a warning about a missing cast.

Author: cbracken

build/secondary/third_party/ocmock/BUILD.gn

@@ -60,18 +60,22 @@ source_set("ocmock_src") {
     "$ocmock_path/OCMock/OCMLocation.m",
     "$ocmock_path/OCMock/OCMMacroState.h",
     "$ocmock_path/OCMock/OCMMacroState.m",
+    "$ocmock_path/OCMock/OCMNonRetainingObjectReturnValueProvider.h",
+    "$ocmock_path/OCMock/OCMNonRetainingObjectReturnValueProvider.m",
     "$ocmock_path/OCMock/OCMNotificationPoster.h",
     "$ocmock_path/OCMock/OCMNotificationPoster.m",
+    "$ocmock_path/OCMock/OCMObjectReturnValueProvider.h",
+    "$ocmock_path/OCMock/OCMObjectReturnValueProvider.m",
     "$ocmock_path/OCMock/OCMObserverRecorder.h",
     "$ocmock_path/OCMock/OCMObserverRecorder.m",
     "$ocmock_path/OCMock/OCMPassByRefSetter.h",
     "$ocmock_path/OCMock/OCMPassByRefSetter.m",
+    "$ocmock_path/OCMock/OCMQuantifier.h",
+    "$ocmock_path/OCMock/OCMQuantifier.m",
     "$ocmock_path/OCMock/OCMRealObjectForwarder.h",
     "$ocmock_path/OCMock/OCMRealObjectForwarder.m",
     "$ocmock_path/OCMock/OCMRecorder.h",
     "$ocmock_path/OCMock/OCMRecorder.m",
-    "$ocmock_path/OCMock/OCMReturnValueProvider.h",
-    "$ocmock_path/OCMock/OCMReturnValueProvider.m",
     "$ocmock_path/OCMock/OCMStubRecorder.h",
     "$ocmock_path/OCMock/OCMStubRecorder.m",
     "$ocmock_path/OCMock/OCMVerifier.h",