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- Previously we appended the license to the os-credits page URL.
- This is incorrect as we need to create the URL with the license
  as a reference fragment. eg. chrome://os-credits/#license
- Update tests to reflect this.

Bug: 1044646
Test: unit + browser tests
Change-Id: I0bbb8067cbffdbcd14ab1ff4b37014c8ef7424ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015674
Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736208}