Revert of Refined DCHECK preventing multiple event forwarders in VA tree path

Revert of Refined DCHECK preventing multiple event forwarders in VA tree path (patchset #9 id:200001 of https://codereview.chromium.org/2861413002/ )

Reason for revert:
Primary suspect making ViewAndroidTest.ChecksMultipleEventForwarders fails consistently

https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests

Original issue's description:
> Refined DCHECK preventing multiple event forwarders in VA tree path
> 
> A ViewAndroid tree path from the top to a leaf node can have only
> a single EventForwarder instance. Rewrote helper methods used for
> DCHECK that enforces the requirement to match the actual job with
> the intention.
> 
> BUG=717271
> 
> Review-Url: https://codereview.chromium.org/2861413002
> Cr-Commit-Position: refs/heads/master@{#470814}
> Committed: https://chromium.googlesource.com/chromium/src/+/1a116ecfdf829702b653ded84a0e1cdb8bdfd7d6

TBR=boliu@chromium.org,jinsukkim@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=717271
Review-Url: https://codereview.chromium.org/2880583002
Cr-Commit-Position: refs/heads/master@{#470938}
Committed: https://chromium.googlesource.com/chromium/src/+/38ac4c9a36f237bcddf1ae1e723a7ee00c841f64

[sebsg, 2017-05-11 13:20:03]

The CQ bit was checked by sebsg@chromium.org

[sebsg, 2017-05-11 13:20:03]

Created Revert of Refined DCHECK preventing multiple event forwarders in VA tree
path

[commit-bot: I haz the power, 2017-05-11 13:20:25]

CQ is trying da patch.

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

[commit-bot: I haz the power, 2017-05-11 13:20:49]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494508803308490, "parent_rev":
"4a9ce9475913bfae22a27a3b4a8413dcc0d38e08", "commit_rev":
"38ac4c9a36f237bcddf1ae1e723a7ee00c841f64"}

[commit-bot: I haz the power, 2017-05-11 13:21:03]

Description was changed from

==========
Revert of Refined DCHECK preventing multiple event forwarders in VA tree path
(patchset #9 id:200001 of https://codereview.chromium.org/2861413002/ )

Reason for revert:
Primary suspect making ViewAndroidTest.ChecksMultipleEventForwarders fails
consistently

https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests

Original issue's description:
> Refined DCHECK preventing multiple event forwarders in VA tree path
> 
> A ViewAndroid tree path from the top to a leaf node can have only
> a single EventForwarder instance. Rewrote helper methods used for
> DCHECK that enforces the requirement to match the actual job with
> the intention.
> 
> BUG=717271
> 
> Review-Url: https://codereview.chromium.org/2861413002
> Cr-Commit-Position: refs/heads/master@{#470814}
> Committed:
https://chromium.googlesource.com/chromium/src/+/1a116ecfdf829702b653ded84a0e...

TBR=boliu@chromium.org,jinsukkim@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=717271
==========

to

==========
Revert of Refined DCHECK preventing multiple event forwarders in VA tree path
(patchset #9 id:200001 of https://codereview.chromium.org/2861413002/ )

Reason for revert:
Primary suspect making ViewAndroidTest.ChecksMultipleEventForwarders fails
consistently

https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests

Original issue's description:
> Refined DCHECK preventing multiple event forwarders in VA tree path
> 
> A ViewAndroid tree path from the top to a leaf node can have only
> a single EventForwarder instance. Rewrote helper methods used for
> DCHECK that enforces the requirement to match the actual job with
> the intention.
> 
> BUG=717271
> 
> Review-Url: https://codereview.chromium.org/2861413002
> Cr-Commit-Position: refs/heads/master@{#470814}
> Committed:
https://chromium.googlesource.com/chromium/src/+/1a116ecfdf829702b653ded84a0e...

TBR=boliu@chromium.org,jinsukkim@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=717271

Review-Url: https://codereview.chromium.org/2880583002
Cr-Commit-Position: refs/heads/master@{#470938}
Committed:
https://chromium.googlesource.com/chromium/src/+/38ac4c9a36f237bcddf1ae1e723a...
==========

[commit-bot: I haz the power, 2017-05-11 13:21:04]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/38ac4c9a36f237bcddf1ae1e723a...