Fixed position of plus image on action box button; added ICON_CENTERED placement to TextButton

BUG=147330

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=156599

Review URL: https://chromiumcodereview.appspot.com/10933049

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156824 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed