Revert 211968 "Embed manifests using 'EmbedManifest' setting in ..."
This appears to have broken the main win clobber builder (which doesn't
use ninja?)
> Embed manifests using 'EmbedManifest' setting in GYP.
>
> GYP supports 'EmbedManifest' and UAC settings for ninja since https://code.google.com/p/gyp/source/detail?r=1675. This CL starts using the GYP settings instead of the custom xxx_manifest targets.
>
> Review URL: https://chromiumcodereview.appspot.com/
19376005
TBR=alexeypa@chromium.org
Review URL: https://codereview.chromium.org/
19533005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212013 0039d316-1c4b-4281-b951-d872f2087c98