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This reverts commit b0caf8a2.

Reason for revert: broke some protocol clients.

Original change's description:
> [DevTools] Perform Session id surgery in Blink.
> 
> That is, for messages coming from Blink, perform the surgery there.
> For messages that come from the browser, perform the surgery in
> content::DevToolsSession as before.
> 
> Longer term, we may include the session id prior to serializing the
> message. But this requires much deeper changes to the bindings etc.,
> so this just moves the computation closer to where it will be
> eventually.
> 
> Change-Id: I16efafec72e8077d7aaab6458f5253ddb018fd96
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1734142
> Commit-Queue: Johannes Henkel <johannes@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#690168}

TBR=dgozman@chromium.org,dcheng@chromium.org,caseq@chromium.org,johannes@chromium.org

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

Change-Id: I89d2e6a11fd38a0ab0484e26af793ebd230692a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771549Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690408}