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Many methods in //net use the "int" return type to return either a
net::Error or a number (e.g., bytes read). However, quite a few methods
also use the "int" return type, even though they only return
net::Errors. AppCacheDiskCache, which is built on top of
//net/disk_cache, followed the same pattern.

This CL replaces int with net::Error where applicable in
AppCacheDiskCache. This is intended to help readers distinguish between
methods that return an error code and methods that may return a number
or an error code.

Change-Id: I495d70e1ba2aaf68d6386125c99d2c2f1f14d481
Reviewed-on: https://chromium-review.googlesource.com/c/1274447Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598864}