[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

android_webview/tools/webview_licenses.py

@@ -41,7 +41,7 @@ def GetIncompatibleDirectories():
 
   whitelist = [
     'Apache( Version)? 2(\.0)?',
-    '(New )?BSD( [23]-Clause)?( with advertising clause)?',
+    '(New )?([23]-Clause )?BSD( [23]-Clause)?( with advertising clause)?',
     'L?GPL ?v?2(\.[01])?( or later)?',
     'MIT(/X11)?(-like)?',
     'MPL 1\.1 ?/ ?GPL 2(\.0)? ?/ ?LGPL 2\.1',