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Another case SelectionPopupController gets a native->Java
flow handed over from ContentViewCore. The feature is relevant
to selection controller, which is now is fully capable of
taking care of it without relying on ContentViewCore thanks
to https://crbug.com/c/956786.

Not related, but did some clean up in content_view_core.h
for method declarations left unused.

Bug: 598880
Change-Id: I5010644a67021632b1e2625167e02c3c4ab947d8
Reviewed-on: https://chromium-review.googlesource.com/963155Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543557}