Make Geolocation internal test methods more resilient.

Source/modules/geolocation/testing/InternalsGeolocation.idl

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
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  * modification, are permitted provided that the following conditions are
  * met:
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  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
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  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-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);
     void setGeolocationPermission(Document document, boolean allowed);
     long numberOfPendingGeolocationPermissionRequests(Document document);
 };