Rename _untrusted targets in third_party to use _nacl suffix

Previously NaCl targets were using _untrusted suffix which makes the
purpose of these targets hard to understand. This CL renames some targets in src/third_party.

Also removed toolsets field from modp_b64_nacl.gyp

Review URL: https://codereview.chromium.org/138673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245176 0039d316-1c4b-4281-b951-d872f2087c98
Add LICENSE file to third_party/fontconfig

Review URL: https://codereview.chromium.org/138723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245177 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245176
SVN changes up to revision 245177