The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5b76c04ae3040e16d924495416b722b2fcf13616

commit 5b76c04ae3040e16d924495416b722b2fcf13616
Author: rob.buis <rob.buis@samsung.com>
Date: Thu Apr 14 02:41:37 2016

PaymentRequest should be a ContextLifecycleObserver

This CL makes PaymentRequest a ContextLifecycleObserver.
Since mojo::Binding::Close() has a precondition that it
is bound, check that in PaymentRequest::cleanUp before
calling Close(), if not Payment unit tests that create
PaymentRequests that do not bind will crash.

BUG= 602660 

Review URL: https://codereview.chromium.org/1880353004

Cr-Commit-Position: refs/heads/master@{#387214}

[modify] https://crrev.com/5b76c04ae3040e16d924495416b722b2fcf13616/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
[modify] https://crrev.com/5b76c04ae3040e16d924495416b722b2fcf13616/third_party/WebKit/Source/modules/payments/PaymentRequest.h

Fixed by r387214.

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