Remove goog.provide for goog.ui.Palette.EventType. No usage afaict.

R=nnaze,gboyer
DELTA=1 (0 added, 1 deleted, 0 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6138


git-svn-id: http://closure-library.googlecode.com/svn/trunk@2438 0b95b8e8-c90f-11de-9d4f-f947ee5921c8