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This reverts commit 623f213f.

Reason for revert: It turned out that we haven't yet reached consensus about the change.

Original change's description:
> Update Blink C++ styleguide
> 
> This CL removes a couple of Blink-specific style rules per the discussion at blink-dev@ (https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/gNRO6_sMWRM/WNR2c6NdAAAJ).
> 
> Bug: None
> Change-Id: I125954a547c11d0021ef38fd6a9aff79f3d69fca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771227
> Auto-Submit: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Jeremy Roman <jbroman@chromium.org>
> Commit-Queue: Jeremy Roman <jbroman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#691153}

TBR=jbroman@chromium.org,haraken@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: None
Change-Id: Ie13c19e16803f87fc130d1483464ce051912df8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784603Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693154}