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Replace the mojo injection to change how PaymentRequests are made
by instead injecting a factory in C++. Future work will do a similar
injection into the Android Java code to change PaymentRequest behaviour
in similar ways.

Use content test helpers to navigate instead of chrome ui desktop-only
helpers.

R=rouslan@chromium.org

Bug: 961849
Change-Id: Id4859416e7457686cc35c9c578ee3a4954fe80e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680861
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673091}