Don't revoke tokens on logout.

It's no longer possible to revoke individual tokens, which means that signing
out of the web-app will cause all of user's hosts to drop off-line. This CL
"fixes" this by not revoking tokens at all. Note that users can still hit the
OAuth token limit, in which case hosts will start dropping off-line one at a
time; this will be addressed by migrating hosts to use robot accounts.

BUG=222527
R=rmsousa@chromium.org

Review URL: https://codereview.chromium.org/149863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247762 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247762
Break some parts of remoting.gyp into separate .gypi files.

BUG=
R=sergeyu@chromium.org

Review URL: https://codereview.chromium.org/139283010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247763 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247763