Exclude skia/tools/clusterfuzz-data from android webview license check

This is not part of public chromium checkout but are included in some
bots.

NOTRY=true
NOTREECHECKS=true
BUG=

Review URL: https://codereview.chromium.org/113853003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242178 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242178