rAc: signin_in_registrar_.IsEmpty() -> !ShouldShowSignInWebView()

BUG=none

Review URL: https://codereview.chromium.org/70073006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235073 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235073
Update harfbuzz-ng to 0.9.24

Update our version of harfbuzz-ng in third_party from 0.9.17 to 0.9.24.

R=behdad@chromium.org
BUG=318953

Review URL: https://codereview.chromium.org/70193010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235074 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235074