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This change exposes a Java method on WebContentsObserverProxy that
allows it to observe render frame deletion and romoves a map entry
in RemoteObjectInjector when renderFrameDeleted is called.

Bug: 1105925
Change-Id: I2c155fc22b494efea40c212b2f4f6caac15b70e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462999Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#816962}