Convert third_party source sets to static libraries.

This covers the third_party code checked directly into Chrome.

BUG=627637

Review-Url: https://codereview.chromium.org/2152033002
Cr-Original-Commit-Position: refs/heads/master@{#405651}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 23302cf2b607bcfa33f7b93860e69d5a49a47635