Revert of Further instrumentations to find jank in Windows message processing.

Revert of Further instrumentations to find jank in Windows message processing. (patchset #1 id:1 of https://codereview.chromium.org/835183002/)

Reason for revert:
Speculative revert for Windows failures on Blink waterfall. They also appear on the trybots so will try a tryjob first.

Original issue's description:
> Further instrumentations to find jank in Windows message processing.
> Based on the latest revelations:
> 440919 WindowImpl::WndProc2 = 90 jph.
> Since the internals of OnWndProc are instrumented, this strangely indicates that it's GetWindowUserData who is responsible for this jank. Instrumenting it.
> 
> 440919 <<MessagePumpForUI::ProcessNextWindowsMessage>> = 46 jph and
> 440919 MessagePumpForUI::ProcessMessageHelper = 39 jph
> This means that with instrumenting MessagePumpForUI::ProcessMessageHelper, we've divided MessagePumpForUI::ProcessNextWindowsMessage into 2 roughly equal parts: everything that happens inside MessagePumpForUI::ProcessMessageHelper, and everything outside (GetQueueStatus and PeekMessage).
> Adding in instrumentation to separate GetQueueStatus from PeekMessage.
> Also instrumenting internals of MessagePumpForUI::ProcessMessageHelper.
> 
> BUG=440919
> 
> Committed: https://crrev.com/4949a513d841da01d66a32f54a98fec518c3fde3
> Cr-Commit-Position: refs/heads/master@{#310156}

TBR=cpu@chromium.org,vadimt@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=440919

[falken, 2015-01-07 02:50:35]

Created Revert of Further instrumentations to find jank in Windows message
processing.

[falken, 2015-01-07 03:23:46]

On 2015/01/07 02:50:35, falken wrote:
> Created Revert of Further instrumentations to find jank in Windows message
> processing.

This patch is innocent, the failures still occur. Closing this issue.