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This reverts commit 6089b211.

Reason for revert: Failure here: https://ci.chromium.org/p/chromium/builders/ci/linux-trusty-rel/4085

I'm half assuming that this test is a bit flaky?

Original change's description:
> [devtools] Allow reloading of extension with devtools
> 
> This patches restricts the changes from [1] to pdf embeds.
> 
> [1]: https://chromium-review.googlesource.com/c/chromium/src/+/1659983
> 
> Bug: chromium:997521
> Change-Id: I8a94c9c1eecf132388508ceed47b426f2c842ed0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798350
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: James MacLean <wjmaclean@chromium.org>
> Commit-Queue: Jan Scheffler <janscheffler@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#708538}

TBR=yangguo@chromium.org,wjmaclean@chromium.org,luoe@chromium.org,janscheffler@chromium.org

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

Bug: chromium:997521
Change-Id: I79849fb39d89d84c4e7a5a9eb72494da13bf5119
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886817Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710336}