Turn on a WPR flag to stablize captured sites tests.

In
https://chromium.googlesource.com/catapult/+/734e7ea0cbf9e0965596350ea51e5b4c8fc623f0,
I introduced a change to Web page Replay Go (WPR Go) to prefer previously
unmatched responses. This change fixed a number of issues with capturing
checkout workflows on captured sites. The change hides the fix behind a
feature flag for compatibility reasons.

This change enables the fix by turning on the feature flag in Captured
Sites tests.

Bug: 850756
Change-Id: I0331b3b5cfe8b0ddde84211bd0b320ef65faa8fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574358
Auto-Submit: Yiming Zhou <uwyiming@google.com>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652291}
1 file changed