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We prefer to eagerly delete all expiring CastWebViews, to prevent UAF
errors if a CastWebView is attempting to use deleted browser objects
very late in the browser lifecycle.

Bug: internal b/150630037
Test: Build/run cast_shell
Change-Id: I9b301c7e76157bb60176dca2588f4bfdff0545c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295937Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797858}