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in Google Update settings.

Consequentially, the backed up client_id now keeps its dashes and crash_keys
strips them at runtime rather than when backing it up
(https://codereview.chromium.org/372473004/ will add support for stripped
client_id backups for some time).

Also rename a lot of methods involved in setting the client id; having all of
them named "SetClientID" makes this series of calls very hard to follow!

BUG=391338
TBR=thestig

Review URL: https://codereview.chromium.org/365133005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282093 0039d316-1c4b-4281-b951-d872f2087c98