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Default arguments on virtual functions are not permitted by the style
guide. The argument was also only unspecified in test code, which is
updated to always specify it.

Change-Id: If415e408c365f5a9c9b68273a369680934cf0ba6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895970
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712358}