Update licenses.py for WebKit and Blink.

third_party/blink was forked from WebKit, so we should credit for WebKit.
Move third_party/WebKit/LICENSE_FOR_ABOUT_CREDITS to third_party/blink.

Remove third_party/WebKit/OWNERS because third_party/WebKit doesn't have
files any longer.

No-Try: true
Bug: 622551
Change-Id: Icdf9b5a08e78848925cd4a7db48d076c1baa328a
Reviewed-on: https://chromium-review.googlesource.com/c/1350011
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611022}
3 files changed