[LSC] Add LOCAL_LICENSE_KINDS to external/chromium-webview am: 50026b34de

Original change: https://android-review.googlesource.com/c/platform/external/chromium-webview/+/1588612

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If363ecf9e7ee67600fef696fd27c93c151a63072