Hide WebRequestEvent Privates

BUG=324859

Review URL: https://codereview.chromium.org/113533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246988 0039d316-1c4b-4281-b951-d872f2087c98
Enable SAML support on Chrome OS by default

This CL enables SAML support for login and enrollment on Chrome OS by
default. The domains for which SAML can be used are still gated by a
server-side whitelist.

BUG=336842
TEST=Updated browser test

TBR=asargent@chromium.org for gaia_auth_extension_loader.cc

Review URL: https://codereview.chromium.org/138663005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246989 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246988
SVN changes up to revision 246989