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In general content embedders are supposed to get web platform features working with reasonable quota. However if they didn't implement this optional method on ContentBrowserClient, service workers' cache storage wouldn't work. Move the logic that all embedders in the repo used into content, and allow tests to override it if necessary.

Also move the logic to use a consistent quota from browser_tests to all browser test based integration tests.

Bug: 1035420
Change-Id: Ib1b7c27f8af35dfd9d6a693d33b3b41d0677ea08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977394
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727791}