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This reverts commit 1d6d5027.

Reason for revert: Suspected culprit of win-asan failure: https://ci.chromium.org/p/chromium/builders/ci/win-asan/15420

Original change's description:
> Hooking up buffer_size in EtwTraceController::StartRealtimeSession
>
> I am working on some ETW stuff for Chrome Remote Desktop and I
> noticed that this parameter is unused and a default value of 16KB
> is always used.  This isn't a big deal as the only caller appears
> to be its unit tests but it seemed like the value passed in
> should do something.  The other approach would be to remove the
> param but adjusting the buffer size seems like a reasonable thing
> to expose (assuming the param is actually used).
>
> Change-Id: I453ac2417d68f6c16fecd517cf1cd74c5aa15731
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511290
> Commit-Queue: Joe Downing <joedow@google.com>
> Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#823240}

TBR=brucedawson@chromium.org,joedow@chromium.org

Change-Id: Iab1337eaf4c762f50074d56d8d7eaa0210fb7d0c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515503Reviewed-by: Meredith Lane <meredithl@chromium.org>
Commit-Queue: Meredith Lane <meredithl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823406}