Revert of Allow std::unordered_*. (patchset #15 id:280001 of https://codereview.chromium.org/1502373009/ )

Reason for revert:
MSan build failure.

https://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20Linux%20ChromeOS%20MSan%20Builder/builds/12498

Original issue's description:
> Allow std::unordered_*.
>
> base::hash_* is, as a transition step, implemented in terms of
> std::unordered_*. Later commits will convert existing uses.
>
> Also fix a host of IWYU problems that arose from this CL.
>
> (NOPRESUBMIT because the wstring presubmit check is overzealous
> and complains about the reference to wstring in the comment.)
>
> NOPRESUBMIT=true
> BUG=576864
> TBR=derat@chromium.org,blundell@chromium.org,jbauman@chromium.org,dalecurtis@chromium.org
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/3f37f7f1459e7b5a452c0e433493e0a6e9649ca7
> Cr-Commit-Position: refs/heads/master@{#370553}

TBR=danakj@chromium.org,thakis@chromium.org,derat@chromium.org,blundell@chromium.org,dalecurtis@chromium.org,jbauman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=576864

Review URL: https://codereview.chromium.org/1610023003

Cr-Commit-Position: refs/heads/master@{#370559}

0 files changed, 0 insertions, 0 deletions