
Suppress the sending of a 'timeout' server reachability event when channel requests of type 'IMG' time out.  This is because when the Image tag they use is created, no attempt is made to notice if/when it succeeds, so the timeout is always going to occur.  I'm not certain if it's fulfilling some purpose, so I made the least disruptive change possible.

R=nicksantos
DELTA=6  (4 added, 0 deleted, 2 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=5457


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@2137 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

weitzj/closure-library,weitzj/closure-library