Fix bug in checkUnionEquivalenceHelper.

R=acleung,nicksantos


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6226


git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2499 b0f006be-c8cd-11de-a2e8-8d36a3108c74
Adding the "name" property to DOMError interface.

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


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6227


git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2500 b0f006be-c8cd-11de-a2e8-8d36a3108c74