
Fixed an issue with abort(true) where it tries to remove XhrIo listeners even if
one doesn't exist for the request.

Also added a getOutstandingRequests method.

R=ssaviano,chrishenry
DELTA=21  (12 added, 0 deleted, 9 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=5128


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@2029 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

Kuniwak/google-closure-library-jsdoc,jarib/google-closure-library,Kuniwak/google-closure-library-jsdoc,jarib/google-closure-library