[Payment Request] Enable hasEnrolledInstrument by default.

Intent to Ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/6rZ7kBLwmhg/lqEpsHLiDgAJ

Bug: 915907
Change-Id: I08825b981d93016b1d8d3647ee76cb4ccea4173a
Reviewed-on: https://chromium-review.googlesource.com/c/1492488
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Philip J├Ągenstedt <foolip@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636494}
6 files changed