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The file name of the AppCache SQLite database is an implementation
detail that is only relevant to the browser process. The renderer should
not be able to access the database directly.

The CL also clarifies the code declaring a few related AppCache
constants. Most importantly, the AppCache code used to implement a
content::kMB global variable, which is now in an anonymous namespace in
the only file that needs it.

Change-Id: I7c66543ded40c241622b0587e2abce1de15b18f5
Reviewed-on: https://chromium-review.googlesource.com/1189345
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586333}