Support removal of DRI platform

All ozone configurations currently build DRI support, and therefore
have a dependency on the libdrm system library. This is not needed
except when ozone_platform_dri is enabled.

This allows us to drop the link to libdrm when it is not needed.

Review URL: https://codereview.chromium.org/62953003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233671 0039d316-1c4b-4281-b951-d872f2087c98
ProfileOAuth2TokenService should handle SERVICE_UNAVAILABLE as transient error.

It shouldn't show UI errors for transient errors.

BUG=311386

Review URL: https://codereview.chromium.org/63293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233672 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233671
SVN changes up to revision 233672