Add Lifetime annotation to some WebView classes

Addiing Lifetime annotation to some WebView classes as part of
Multi-Profile work.

See //android_webview/docs/lifetime-annotations.md

Change-Id: I856cc2fbcf56c63986637da0d675b4df3735503a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4778565
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Sayed Elabady <elabadysayed@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1185121}