
Automated g4 rollback

*** Reason for rollback ***

breaks ff3.6 tests for unclear reasons

*** Original change description ***

Tweak the sourceUrl decision tree a bit, and update
the comments on when this should be used.

DELTA=35 (8 added, 18 deleted, 9 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6126


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@2432 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

knutwalker/google-closure-library,knutwalker/google-closure-library