
Remove option to use XHR streaming in IE8,
and add links to discussion on why this doesn't work.

R=dbk
DELTA=28  (1 added, 21 deleted, 6 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=3734


yamadatomonori/closure-library,yamadatomonori/closure-library,yamadatomonori/closure-library