Revert of Make it possible for tests to set up trace event handlers.

Revert of Make it possible for tests to set up trace event handlers. (patchset #4 id:60001 of https://codereview.webrtc.org/3002663002/ )

Reason for revert:
Breaks Chromium bots.
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Mac%20Builder/builds/27340/steps/generate_build_files/logs/stdio

Original issue's description:
> Make it possible for tests to set up trace event handlers.
> 
> As it is now, the first time a TRACE_EVENT... is called, the result from
> the current handler is stored in a static const variable, and subsequent
> calls will use that value regardless of changes to the handler.
> 
> This is a problem if a test wants to use another handler.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/3002663002
> Cr-Commit-Position: refs/heads/master@{#19382}
> Committed: https://chromium.googlesource.com/external/webrtc/+/a9732656221e0033ab93ecf01cf07f71817da1e8

TBR=hbos@webrtc.org,kwiberg@webrtc.org,mbonadei@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2997963002
Cr-Commit-Position: refs/heads/master@{#19383}
Committed: https://chromium.googlesource.com/external/webrtc/+/db758c2589a983a7dd94dfdd9272892e28251fe4

[ehmaldonado_webrtc, 2017-08-17 13:06:54]

The CQ bit was checked by ehmaldonado@webrtc.org

[ehmaldonado_webrtc, 2017-08-17 13:06:54]

Created Revert of Make it possible for tests to set up trace event handlers.

[commit-bot: I haz the power, 2017-08-17 13:06:58]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-08-17 13:07:03]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1502975214322510, "parent_rev":
"a9732656221e0033ab93ecf01cf07f71817da1e8", "commit_rev":
"db758c2589a983a7dd94dfdd9272892e28251fe4"}

[commit-bot: I haz the power, 2017-08-17 13:07:08]

Description was changed from

==========
Revert of Make it possible for tests to set up trace event handlers. (patchset
#4 id:60001 of https://codereview.webrtc.org/3002663002/ )

Reason for revert:
Breaks Chromium bots.
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Mac%20Builder/build...

Original issue's description:
> Make it possible for tests to set up trace event handlers.
> 
> As it is now, the first time a TRACE_EVENT... is called, the result from
> the current handler is stored in a static const variable, and subsequent
> calls will use that value regardless of changes to the handler.
> 
> This is a problem if a test wants to use another handler.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/3002663002
> Cr-Commit-Position: refs/heads/master@{#19382}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/a9732656221e0033ab93ecf01...

TBR=hbos@webrtc.org,kwiberg@webrtc.org,mbonadei@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
==========

to

==========
Revert of Make it possible for tests to set up trace event handlers. (patchset
#4 id:60001 of https://codereview.webrtc.org/3002663002/ )

Reason for revert:
Breaks Chromium bots.
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Mac%20Builder/build...

Original issue's description:
> Make it possible for tests to set up trace event handlers.
> 
> As it is now, the first time a TRACE_EVENT... is called, the result from
> the current handler is stored in a static const variable, and subsequent
> calls will use that value regardless of changes to the handler.
> 
> This is a problem if a test wants to use another handler.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/3002663002
> Cr-Commit-Position: refs/heads/master@{#19382}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/a9732656221e0033ab93ecf01...

TBR=hbos@webrtc.org,kwiberg@webrtc.org,mbonadei@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2997963002
Cr-Commit-Position: refs/heads/master@{#19383}
Committed:
https://chromium.googlesource.com/external/webrtc/+/db758c2589a983a7dd94dfdd9...
==========

[commit-bot: I haz the power, 2017-08-17 13:07:09]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/db758c2589a983a7dd94dfdd9...

[ehmaldonado_webrtc, 2017-08-17 13:56:11]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2995123002/ by ehmaldonado@webrtc.org.

The reason for reverting is: This should fix it.