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The various libsecret methods have different contracts w.r.t. unlocking
keyring items. Of the currently used methods, only secret_service_store
will trigger unlocking as necessary. As a result, operations fail in
various ways until someone performs the first store operation.

With the CL, the libsecret native backend of Password Manager is set to explicitly
request unlocking of items on every call. OSCrypt avoids using
secret_service_lookup, which apparently ignores locked items.

BUG=657828,631171

Review-Url: https://codereview.chromium.org/2441653002
Cr-Commit-Position: refs/heads/master@{#427067}