[Refactor] Refactor WebUsbAllowDevicesForUrlsPolicyHandlerTest

This CL:
* replaces calls to deprecated base::JSONReader::ReadDeprected
  with the newer Read() method that returns a base::Optional instead.
* updates all EXPECT/ASSERT_EQs to have the expected value first.

Bug: none
Change-Id: If2943a6ea019d243f04630f5931cf1ee44ed1295
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647876
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671218}
1 file changed