Make goog.ui.Component calls super-class disposeInternal last.

R=gboyer
DELTA=4 (1 added, 2 deleted, 1 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6242


git-svn-id: http://closure-library.googlecode.com/svn/trunk@2496 0b95b8e8-c90f-11de-9d4f-f947ee5921c8