Merge "Merge "webkit: Update documentation for onJsConfirm, onJsPrompt callbacks" into rvc-dev am: a0b41154fe am: c82858208b" into rvc-d1-dev-plus-aosp am: 18fbd5e4ea

Change-Id: I762038b66a6eaa3856f0f744bc7c414d3b2df2ee