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[fuchsia] Extract common Frame setup from WebEngineIntegrationTests

Also breaks out the multiple cases in the *UserAgent tests into
individual WebEngineIntegrationUserAgentTests.

Change-Id: I4aab782d55ff327456d6a2b638739b0c4ec86204
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421655
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808955}