Revert 182925 because it breaks the official build with the following error:

Revert 182925 because it breaks the official build with the following error:

> 562>host/win/remoting_host.manifest : manifest authoring error c1010001: Values of attribute "level" not equal in different manifest snippets.

> Make remoting DLLs isolation aware.
>
> This CL enables the ISOLATION_AWARE_ENABLED flag when building remoting DLLs. This allows them to specify the version of comctl32.dll to link agains independently from the hosting EXE.
>
> Collateral changes:
>  - The manifests are specified via 'AdditionalManifestFiles' instead of having a separate action that embeds a manifest into a binary. This simplifies GYP a lot at the cost of not having manifests embedded when building with ninja. The official builders use msbuild at the moment. Ability to embed manifest should be added to ninja, if the official builders were switched to ninja (if ever).
>  - A manifest specifying dependency on comctl32.dll v6 was added to remoting_host_plugin.dll.
>
> BUG=176460
>
>
> Review URL: https://chromiumcodereview.appspot.com/12283006

TBR=alexeypa@chromium.org
Review URL: https://codereview.chromium.org/12297003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183005 0039d316-1c4b-4281-b951-d872f2087c98