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service worker: Add a namespace in service_worker_database.cc for Jumbo

This is a follow up to https://chromium-review.googlesource.com/c/chromium/src/+/758869,
which added "ServiceWorker" to some of the constants. That approach seems misleading
since it looks like "ServiceWorkerKey" is a type of key on the same level as a "RegKey"
or "ResKey". Really we want to add "ServiceWorker" to all the constants, which we
can accomplish by making a namespace.

Bug: 746953
Change-Id: I61dffdaecffbeb088906f67907fdc47f0f81a5e1
Reviewed-on: https://chromium-review.googlesource.com/765556Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515920}