[WebLayer] Clean up for CanMakePayment and HasEnrolledInstrument

Changes:
* Moved canMakePayment() and hasEnrolledInstrument() into PRService.
  After the CL, these can be handled completely within PRService.
* Moved the onCanMakePaymentCalculated() logic into PRService
* Cleaned up unused properties in CPRService:
 - mRequestPayerName
 - mRequestPayerPhone
 - mShippingType
 - mIsHasEnrolledInstrumentResponsePending
 - mQueryForQuota
* Inlined methods and remove unused setter/getter in PRService.

Bug: 1131059

Change-Id: I9a7a3c4f9403bcde0f6c8a192c6743267a5c5452
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518598
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824460}