Replace RE2 import with a dependency

TBR=armansito@chromium.org,reillyg@chromium.org,piman@chromium.org
BUG=568119

Review URL: https://codereview.chromium.org/1544433002

Cr-Commit-Position: refs/heads/master@{#366412}
NOKEYCHECK=True
GitOrigin-RevId: 0739c642c9acce9e05ac8bb936a55fc6230a96f0
126 files changed
tree: e9e1b9d8a08a5bb07b7e92058ed0a2ae2eab3985
  1. BUILD.gn
  2. DEPS
  3. LICENSE
  4. OWNERS
  5. re2.gyp
  6. README.chromium