Cleanup: Remove unused IDS entries from build/ios/grit_whitelist.txt.

Review URL: https://codereview.chromium.org/136153002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244713 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244713