[Android WebView] Relax license parsing for BSD
This adds "2-clause BSD" and "3-clause BSD" to whitelisted licenses.
This is only a wording issue, since "BSD 2-clause" and "BSD 3-clause"
are already whitelisted.
This makes third_party/mach_override pass webview license check, even
though that particular library is not used by webview.
BUG=315381
NOTRY=true
TBR=joth
Review URL: https://codereview.chromium.org/
62663002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233530 0039d316-1c4b-4281-b951-d872f2087c98