Make Geolocation internal test methods more resilient.

Source/modules/geolocation/testing/InternalsGeolocation.idl

Index: Source/modules/geolocation/testing/InternalsGeolocation.idl
diff --git a/Source/modules/geolocation/testing/InternalsGeolocation.idl b/Source/modules/geolocation/testing/InternalsGeolocation.idl
index ac6b2d34c1ebdd666de84a2c7c17126955f6ec97..1619c21e2610ad7d93cea19c31352546dbea1121 100644
--- a/Source/modules/geolocation/testing/InternalsGeolocation.idl
+++ b/Source/modules/geolocation/testing/InternalsGeolocation.idl
@@ -28,7 +28,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-partial interface Internals {
+[
+    TypeChecking=Interface
+] partial interface Internals {
     void setGeolocationClientMock(Document document);
     void setGeolocationPosition(Document document, double latitude, double longitude, double accuracy);
     void setGeolocationPositionUnavailableError(Document document, DOMString message);