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As a last file doesn't make sense for WebLayer this is structuring
the code in such a way that the last file related code is not in
the base class.

This does the following:
renames BaseSessionService* to CommandStorageManager*

Next step is to move the functions related to a 'last file' out of
CommandStorageManagerinto CommandStorageManagerWithBackup. Specifically
the functions:
MoveCurrentSessionToLastSession, DeleteLastSession,
ScheduleGetLastSessionCommands. CommandStorageManagerWithBackup
will subclass CommandStorageManager.

SessionBackend will be similarly split such that functions related to last
session are moved into SessionBackendWithBackup, which will extend
SessionBackend.

I'm not dead set on the 'WithBackup' suffix. It's not really
a backup, so much as the last session. I considered the prefix
'MultiFile' but that's a bit too generic and obscure. I'm certainly
open to other suggestions.

BUG=112512
TEST=none

Change-Id: I33d2c9be43bbaea4336fa32bdb3fe750d39f543a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005809Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732878}