Build components and run components_tests on iOS

This CL also adds a missing iOS string that was preventing dom_distiller from compiling on iOS.

BUG=NONE

Review URL: https://codereview.chromium.org/25706003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226799 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226801 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226799
SVN changes up to revision 226801