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This cl renames isChanging() to isWaitingForPaymentDetailsUpdate().
This function returns true after changePaymentMethod(),
changeShippingAddress(), and changeShippingOption() calls an before
updateWith() or NoUpdatedPaymentDetails() are called, showing that
change events are fired and we are waiting for merchants response.

This cl also renames noUpdatedPaymentDetials() method to
onPaymentDetailsNotUpdated() since the latter is more appropriate for
showing that the merchant has not updated any payment details in
response to change payment method, shipping address, or shipping
option events.

TBR=kenrb@chromium.org

Bug: 984694
Change-Id: I9b9b5080c31b58432a42f611b880afa21fa79ec0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946597
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720675}