Add tools/swarm_client/third_party as unknown license.

This is because colorama is missing license header on its files, even if
LICENSE.txt is included. Note that these files are not needed for the build
process to complete.

R=phajdan.jr@chromium.org
NOTRY=true
BUG=colorama:44

Review URL: https://chromiumcodereview.appspot.com/23654007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221296 0039d316-1c4b-4281-b951-d872f2087c98

tools/checklicenses/checklicenses.py

@@ -362,6 +362,12 @@ PATH_SPECIFIC_WHITELISTED_LICENSES = {
     'third_party/sqlite': [
         'UNKNOWN',
     ],
+
+    # https://code.google.com/p/colorama/issues/detail?id=44
+    'tools/swarm_client/third_party/colorama': [
+        'UNKNOWN',
+    ],
+
     'third_party/swig/Lib/linkruntime.c': [  # http://crbug.com/98585
         'UNKNOWN',
     ],