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This reverts commit 0ea2267a.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 580029 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzBlYTIyNjdhN2NlZmE0OWZmZDNmMzA4MGRjZWEyNDFkOWJiY2RmZDcM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.memory/Linux%20CFI/9359

Sample Failed Step: not_site_per_process_browser_tests

Original change's description:
> Fix crash when right clicking link in CastUI
> 
> This CL adds a null check to RenderViewContextMenu::AppendLinkItems()
> ensuring we have an associated Browser before attempting to use it.
> 
> Bug: 869280
> Change-Id: Ib1ffecd9dfbe27fb4fc6f6c77762c6337c36d4d4
> Reviewed-on: https://chromium-review.googlesource.com/1158110
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Commit-Queue: Alan Cutter <alancutter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580029}

Change-Id: Ie3a0067047c42fc8682ca8663eede8f1195afaed
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 869280
Reviewed-on: https://chromium-review.googlesource.com/1159804
Cr-Commit-Position: refs/heads/master@{#580095}