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This CL applies straightforward fixes for the following code health
issues:

1) ClientUsageTracker's constructor stores a reference to its
   SpecialStoragePolicy parameter, so the parameter should be a
   scoped_refptr, not a raw pointer.

2) SupportsWeakPtr is deprecated in favor of using WeakPtrFactory
   directly.

3) DISALLOW_COPY_AND_ASSIGN() is deprecated in favor of explicitly
   =delete-ing the copy constructor and copy assignment operators.

Change-Id: I1b624abfa4779005401623278eca6584be1dbf23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2281087
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785987}