Cherry-pick: [WebView] Remove direct dependencies on hidden APIs.

Manually cherry-picked from commit 45702509d4752478188935eaf442c549c2c220be
and resolved conflicts.

BUG:18152150

Change-Id: If2b6c43f322b4223460b1be6c633858476244756
6 files changed
tree: 36932be5cbad41e7896325e60be25d8b70402182
  1. chromium/
  2. Android.mk