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Context:
The WebLayerPaymentRequest flag is duplicate in functionality with
the WebPayments flag that is being used to disable PaymentRequest in
WebLayer, e.g.,
out/Debug/bin/run_weblayer_shell --args="--enable-features=WebPayments"

So this CL is to remove the WebLayerPaymentRequest flag.

Bug: 1140798

Change-Id: I55edb3249979f9c1bbe0e0dcc23eb19f6578da0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497990
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820818}