Revert of PaymentHandler: Implement PaymentInstruments.keys().

Revert of PaymentHandler: Implement PaymentInstruments.keys(). (patchset #3 id:40001 of https://codereview.chromium.org/2850203002/ )

Reason for revert:
This patch is causing some PaymentManager tests to fail.

Original issue's description:
> PaymentHandler: Implement PaymentInstruments.keys().
> 
> The method to return keys of the stored payment instruments in insertion order.
> 
> Related Spec Link:
>   https://w3c.github.io/webpayments-payment-handler/#paymentinstruments-interface
> 
> BUG=661608
> TEST=payment_manager_unittest.cc, payment-instruments.html
> 
> Review-Url: https://codereview.chromium.org/2850203002
> Cr-Commit-Position: refs/heads/master@{#468747}
> Committed: https://chromium.googlesource.com/chromium/src/+/09c61ecc5adf140aa7a59aef0ecacc510e0be1d8

TBR=rouslan@chromium.org,tsepez@chromium.org,nhiroki@chromium.org,jinho.bang@samsung.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=661608
Review-Url: https://codereview.chromium.org/2858773002
Cr-Commit-Position: refs/heads/master@{#468773}
Committed: https://chromium.googlesource.com/chromium/src/+/9d3c221bdef03b02ef3ed0fe150433592d960f19

[adithyas, 2017-05-02 21:19:35]

The CQ bit was checked by adithyas@chromium.org

[adithyas, 2017-05-02 21:19:36]

Created Revert of PaymentHandler: Implement PaymentInstruments.keys().

[commit-bot: I haz the power, 2017-05-02 21:20:04]

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, 2017-05-02 21:20:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493759975845880, "parent_rev":
"db3935419caccd8a984db80021d73ca579fe6d05", "commit_rev":
"9d3c221bdef03b02ef3ed0fe150433592d960f19"}

[commit-bot: I haz the power, 2017-05-02 21:21:44]

Description was changed from

==========
Revert of PaymentHandler: Implement PaymentInstruments.keys(). (patchset #3
id:40001 of https://codereview.chromium.org/2850203002/ )

Reason for revert:
This patch is causing some PaymentManager tests to fail.

Original issue's description:
> PaymentHandler: Implement PaymentInstruments.keys().
> 
> The method to return keys of the stored payment instruments in insertion
order.
> 
> Related Spec Link:
>  
https://w3c.github.io/webpayments-payment-handler/#paymentinstruments-interface
> 
> BUG=661608
> TEST=payment_manager_unittest.cc, payment-instruments.html
> 
> Review-Url: https://codereview.chromium.org/2850203002
> Cr-Commit-Position: refs/heads/master@{#468747}
> Committed:
https://chromium.googlesource.com/chromium/src/+/09c61ecc5adf140aa7a59aef0eca...

TBR=rouslan@chromium.org,tsepez@chromium.org,nhiroki@chromium.org,jinho.bang@...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=661608
==========

to

==========
Revert of PaymentHandler: Implement PaymentInstruments.keys(). (patchset #3
id:40001 of https://codereview.chromium.org/2850203002/ )

Reason for revert:
This patch is causing some PaymentManager tests to fail.

Original issue's description:
> PaymentHandler: Implement PaymentInstruments.keys().
> 
> The method to return keys of the stored payment instruments in insertion
order.
> 
> Related Spec Link:
>  
https://w3c.github.io/webpayments-payment-handler/#paymentinstruments-interface
> 
> BUG=661608
> TEST=payment_manager_unittest.cc, payment-instruments.html
> 
> Review-Url: https://codereview.chromium.org/2850203002
> Cr-Commit-Position: refs/heads/master@{#468747}
> Committed:
https://chromium.googlesource.com/chromium/src/+/09c61ecc5adf140aa7a59aef0eca...

TBR=rouslan@chromium.org,tsepez@chromium.org,nhiroki@chromium.org,jinho.bang@...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=661608

Review-Url: https://codereview.chromium.org/2858773002
Cr-Commit-Position: refs/heads/master@{#468773}
Committed:
https://chromium.googlesource.com/chromium/src/+/9d3c221bdef03b02ef3ed0fe1504...
==========

[commit-bot: I haz the power, 2017-05-02 21:21:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9d3c221bdef03b02ef3ed0fe1504...