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Before:
PaymentRequestImpl implements PaymentRequest

After:
ComponentPaymentRequestImpl implements PaymentRequest, and delegate the
implementation to PaymentRequestImpl.

Bug: 1102522

Change-Id: I3e3ea0b6a0abb12f4efa983dc8ee697117f40095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285243
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786159}