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This CL fixes a bug in IdentityTokenCache::GetToken function that
incorrectly handles expired tokens. The code contained a DCHECK that is
triggered all the time when the access token cache returns an expired
token.

This CL modifies IdentityTokenCache::GetToken to iterate over several
possible match candidates discarding all expired tokens.

Bug: 1127187, 1100535
Change-Id: I30390b76debb740a5bf43df89383d35695dcc6c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404851
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806214}