c66badec60c4277553279f29a3b30720ba90a6ef
(This is a merge of http://go/wvgerrit/13910/ from the Widevine CDM repository.) DeviceFiles has a lot of repeated code whenever it needs to check for file existence or remove a file. When reading and writing files, it has wrappers that handle this repeated burden. This change adds wrappers for the other functionality used by DeviceFiles as well, to reduce duplication. Change-Id: If959b504672c1b907346d28f31648d8028de8bdf
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