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Description:
PaymentRequestImpl(PRImpl) and ComponentPaymentRequestImpl(CPRImpl)
will have mutual reference starting from their constructors.

Change:
* Before - PRImpl was created at PRFactory#createImpl. After - PRImpl
is created at CPRImpl#init.
* Rename ComponentPaymentRequestDelegate BrowserPaymentRequest, and
make it an individual file. This gives the interface independent
semantics (no longer just part of CPRImpl) - "the browser part of the
PaymentRequest implementation"

Bug: 1102522

Change-Id: I19a5144c23f0f45a8ef7ce3d72752a2b90bef296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340402
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796434}