Reland of Enable HttpFormWarning in fieldtrial_testing_config.json

Reland of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset #1 id:1 of https://codereview.chromium.org/2634093003/ )

Reason for revert:
This seemed to trigger a previously existing test issue, which I fixed in https://bugs.chromium.org/p/chromium/issues/detail?id=681710&desc=2#c14. I'll keep an eye on the flakiness dashboard after relanding this to make sure it's fixed.

Original issue's description:
> Revert of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset #1 id:1 of https://codereview.chromium.org/2629663002/ )
> 
> Reason for revert:
> Likely causing flakiness of PasswordManagerBrowserTestBase.InFrameNavigationDoesNotClearPopupState on Mac10.11/Mac10.10/Mac10.9 Tests.
> 
> Original issue's description:
> > Enable HttpFormWarning in fieldtrial_testing_config.json
> > 
> > BUG=674320
> > 
> > Review-Url: https://codereview.chromium.org/2629663002
> > Cr-Commit-Position: refs/heads/master@{#443946}
> > Committed: https://chromium.googlesource.com/chromium/src/+/56732c5de584ab7b38ba694204beaf038669cf9c
> 
> TBR=jwd@chromium.org,estark@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=674320, 681710
> 
> Review-Url: https://codereview.chromium.org/2634093003
> Cr-Commit-Position: refs/heads/master@{#444036}
> Committed: https://chromium.googlesource.com/chromium/src/+/b850623ef5632ca96ffcc65c13d036ca0ab3271d

TBR=jwd@chromium.org,pkalinnikov@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=674320, 681710
Review-Url: https://codereview.chromium.org/2641893002
Cr-Commit-Position: refs/heads/master@{#444404}
Committed: https://chromium.googlesource.com/chromium/src/+/c890ad04b852fcc9834b988cf896534228144bb4

[estark, 2017-01-18 16:25:03]

The CQ bit was checked by estark@chromium.org

[estark, 2017-01-18 16:25:03]

Created Reland of Enable HttpFormWarning in fieldtrial_testing_config.json

[commit-bot: I haz the power, 2017-01-18 16:25:31]

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, 2017-01-18 17:10:21]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484756703484290, "parent_rev":
"927a3002f49f873a56a67b5c7a8db80032aef75b", "commit_rev":
"c890ad04b852fcc9834b988cf896534228144bb4"}

[commit-bot: I haz the power, 2017-01-18 17:10:56]

Description was changed from

==========
Reland of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset #1
id:1 of https://codereview.chromium.org/2634093003/ )

Reason for revert:
This seemed to trigger a previously existing test issue, which I fixed in
https://bugs.chromium.org/p/chromium/issues/detail?id=681710&desc=2#c14. I'll
keep an eye on the flakiness dashboard after relanding this to make sure it's
fixed.

Original issue's description:
> Revert of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset
#1 id:1 of https://codereview.chromium.org/2629663002/ )
> 
> Reason for revert:
> Likely causing flakiness of
PasswordManagerBrowserTestBase.InFrameNavigationDoesNotClearPopupState on
Mac10.11/Mac10.10/Mac10.9 Tests.
> 
> Original issue's description:
> > Enable HttpFormWarning in fieldtrial_testing_config.json
> > 
> > BUG=674320
> > 
> > Review-Url: https://codereview.chromium.org/2629663002
> > Cr-Commit-Position: refs/heads/master@{#443946}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/56732c5de584ab7b38ba694204be...
> 
> TBR=jwd@chromium.org,estark@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=674320,681710
> 
> Review-Url: https://codereview.chromium.org/2634093003
> Cr-Commit-Position: refs/heads/master@{#444036}
> Committed:
https://chromium.googlesource.com/chromium/src/+/b850623ef5632ca96ffcc65c13d0...

TBR=jwd@chromium.org,pkalinnikov@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=674320,681710
==========

to

==========
Reland of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset #1
id:1 of https://codereview.chromium.org/2634093003/ )

Reason for revert:
This seemed to trigger a previously existing test issue, which I fixed in
https://bugs.chromium.org/p/chromium/issues/detail?id=681710&desc=2#c14. I'll
keep an eye on the flakiness dashboard after relanding this to make sure it's
fixed.

Original issue's description:
> Revert of Enable HttpFormWarning in fieldtrial_testing_config.json (patchset
#1 id:1 of https://codereview.chromium.org/2629663002/ )
> 
> Reason for revert:
> Likely causing flakiness of
PasswordManagerBrowserTestBase.InFrameNavigationDoesNotClearPopupState on
Mac10.11/Mac10.10/Mac10.9 Tests.
> 
> Original issue's description:
> > Enable HttpFormWarning in fieldtrial_testing_config.json
> > 
> > BUG=674320
> > 
> > Review-Url: https://codereview.chromium.org/2629663002
> > Cr-Commit-Position: refs/heads/master@{#443946}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/56732c5de584ab7b38ba694204be...
> 
> TBR=jwd@chromium.org,estark@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=674320,681710
> 
> Review-Url: https://codereview.chromium.org/2634093003
> Cr-Commit-Position: refs/heads/master@{#444036}
> Committed:
https://chromium.googlesource.com/chromium/src/+/b850623ef5632ca96ffcc65c13d0...

TBR=jwd@chromium.org,pkalinnikov@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=674320,681710

Review-Url: https://codereview.chromium.org/2641893002
Cr-Commit-Position: refs/heads/master@{#444404}
Committed:
https://chromium.googlesource.com/chromium/src/+/c890ad04b852fcc9834b988cf896...
==========

[commit-bot: I haz the power, 2017-01-18 17:10:57]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/c890ad04b852fcc9834b988cf896...