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This reverts commit e76e0e99.

Reason for revert: I suspect it caused recent Windows MSVC build failures (https://luci-milo.appspot.com/buildbot/chromium.win/WinMSVC64%20%28dbg%29/2260. The problematic file is chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc.

Original change's description:
> Add timestamp to requests for experimental contextual suggestions.
> 
> The experimental contextual suggestions service provides 0-suggest
> autocomplete suggestions based on the URL that is visited in the active
> tab, at the time the address bar is focused. This CL adds to the request
> a timestamp corresponding to the time the user started navigating the
> URL for which the suggestions are requested.
> 
> This change is a requirement for the process of enabling server-side
> logging of the contextual suggestions that are sent to Chrome clients.
> If logged, contextual suggestions are to be removed as soon as a
> synced user removes from their history the page that was visited at the
> time the suggestions were displayed. The timestamp is necessary for
> matching suggestions with the corresponding navigation.
> 
> TBR=rohitrao
> for mechanical changes to ios/c/b/a/*
> 
> Bug: 692471
> Change-Id: I6939d108cfab91b69640acdbb3b8307687999320
> Reviewed-on: https://chromium-review.googlesource.com/879167
> Commit-Queue: Gheorghe Comanici <gcomanici@chromium.org>
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Reviewed-by: Rohit Rao <rohitrao@chromium.org>
> Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#531999}

TBR=rohitrao@chromium.org,mpearson@chromium.org,jdonnelly@chromium.org,gcomanici@chromium.org

Change-Id: Ie588cd5849a59c845b51c9ca334b32bef4a61037
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 692471
Reviewed-on: https://chromium-review.googlesource.com/889142Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532043}