
Add support to goog.net.XhrIo for the new responseType mechanism.

This mechanism allows XHRs to be read into local Blobs, which can then be saved
to the filesystem for offline use.

R=nicksantos
DELTA=129  (127 added, 0 deleted, 2 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=199


git-svn-id: 818616af560c21f974e3119d89e3310384da871a@662 b0f006be-c8cd-11de-a2e8-8d36a3108c74

nuxleus/closure-compiler,nuxleus/closure-compiler