[refactor]  Remove Unused API from RenderViewHostDelegate

The methods removed have been initially added in
https://codereview.chromium.org/712723002 in regards to "link
disambiguation popup suppression in the presence of virtual keyboard".
The logic however was later removed in:
which rendered removed methods useless. This CL removes the said
methods from RenderViewHostDelegate.

Bug: 605299
Change-Id: Ib4c942132dcb2ebd2364bc15898ccf84520d1b48
Reviewed-on: https://chromium-review.googlesource.com/665419
Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: Charlie Reis (slow) <creis@chromium.org>
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501986}
5 files changed