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This reverts commit 61bb69af.

Reason for revert: Removing debug instrumentation before branch.

Original change's description:
> Add debug BeginFrame tracking
> 
> Add some temporary member variables to BeginFrameTracker that stores the
> total sent/received and the last 10 sent/received BeginFrameIds. Despite
> adding logic to stop sending OnBeginFrame() to unresponsive clients it
> didn't help with the large number of unread messages in mojo message
> queue. This information will do a better job of verifying if client is
> in fact reading (and responding to) the OnBeginFrame() messages.
> 
> The |begin_frame_tracker_| is included in a few minidumps I looked at
> it, so this information should be available in crash reports. Otherwise
> we'll have to copy the information into the stack in OnBeginFrame().
> 
> Bug: 1011441
> Change-Id: I44112d933fb4470fb037e7bfd2d9dc05dd826a94
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994093
> Reviewed-by: Saman Sami <samans@chromium.org>
> Commit-Queue: kylechar <kylechar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#730310}

TBR=kylechar@chromium.org,samans@chromium.org

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

Bug: 1011441
Change-Id: I3c7d5572c19ede7d653d24175d7023e7a7e282c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025768Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736090}