Revert of Add CHECK()s about ImageLoader::has_pending_load_event_

Revert of Add CHECK()s about ImageLoader::has_pending_load_event_ (patchset #12 id:220001 of https://codereview.chromium.org/2859383002/ )

Reason for revert:
Assertion failures in the wild and on clusterfuzz.
BUG=721994
Original issue's description:
> Add CHECK()s about ImageLoader::has_pending_load_event_
> 
> As preparation for [1], this CL checks some assumptions to hold that
> are helpful for proving the equivalences in [1].
> 
> [1] https://codereview.chromium.org/2859093003/
> 
> BUG=624697, 719759
> 
> Review-Url: https://codereview.chromium.org/2859383002
> Cr-Commit-Position: refs/heads/master@{#471464}
> Committed: https://chromium.googlesource.com/chromium/src/+/1b070387595668ec438ffec65185e61017300e3c

TBR=japhet@chromium.org,yhirano@chromium.org,kinuko@chromium.org,kouhei@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624697, 719759
Review-Url: https://codereview.chromium.org/2878263002
Cr-Commit-Position: refs/heads/master@{#471598}
Committed: https://chromium.googlesource.com/chromium/src/+/9d5bcf58d9932d151f12231a6544b67903780fed

[hiroshige, 2017-05-13 18:03:06]

The CQ bit was checked by hiroshige@chromium.org

[hiroshige, 2017-05-13 18:03:06]

Created Revert of Add CHECK()s about ImageLoader::has_pending_load_event_

[commit-bot: I haz the power, 2017-05-13 18:03:14]

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, 2017-05-13 18:03:32]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494698586016210, "parent_rev":
"727830d6051803fe78533922089672dfb652b3ac", "commit_rev":
"9d5bcf58d9932d151f12231a6544b67903780fed"}

[commit-bot: I haz the power, 2017-05-13 18:03:43]

Description was changed from

==========
Revert of Add CHECK()s about ImageLoader::has_pending_load_event_ (patchset #12
id:220001 of https://codereview.chromium.org/2859383002/ )

Reason for revert:
Assertion failures in the wild and on clusterfuzz.
BUG=721994

Original issue's description:
> Add CHECK()s about ImageLoader::has_pending_load_event_
> 
> As preparation for [1], this CL checks some assumptions to hold that
> are helpful for proving the equivalences in [1].
> 
> [1] https://codereview.chromium.org/2859093003/
> 
> BUG=624697, 719759
> 
> Review-Url: https://codereview.chromium.org/2859383002
> Cr-Commit-Position: refs/heads/master@{#471464}
> Committed:
https://chromium.googlesource.com/chromium/src/+/1b070387595668ec438ffec65185...

TBR=japhet@chromium.org,yhirano@chromium.org,kinuko@chromium.org,kouhei@chrom...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624697, 719759
==========

to

==========
Revert of Add CHECK()s about ImageLoader::has_pending_load_event_ (patchset #12
id:220001 of https://codereview.chromium.org/2859383002/ )

Reason for revert:
Assertion failures in the wild and on clusterfuzz.
BUG=721994

Original issue's description:
> Add CHECK()s about ImageLoader::has_pending_load_event_
> 
> As preparation for [1], this CL checks some assumptions to hold that
> are helpful for proving the equivalences in [1].
> 
> [1] https://codereview.chromium.org/2859093003/
> 
> BUG=624697, 719759
> 
> Review-Url: https://codereview.chromium.org/2859383002
> Cr-Commit-Position: refs/heads/master@{#471464}
> Committed:
https://chromium.googlesource.com/chromium/src/+/1b070387595668ec438ffec65185...

TBR=japhet@chromium.org,yhirano@chromium.org,kinuko@chromium.org,kouhei@chrom...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624697, 719759

Review-Url: https://codereview.chromium.org/2878263002
Cr-Commit-Position: refs/heads/master@{#471598}
Committed:
https://chromium.googlesource.com/chromium/src/+/9d5bcf58d9932d151f12231a6544...
==========

[commit-bot: I haz the power, 2017-05-13 18:03:43]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9d5bcf58d9932d151f12231a6544...

[kouhei (in TOK), 2017-05-14 03:44:04]

lgtm

[kinuko, 2017-05-14 22:32:49]

lgtm