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The keychain was re-authorized to support Chrome's new signing
certificate 18+ months ago. At this point, users who haven't re-launch
Chrome in 18 months are unlikely to do so, or need the keychain. This
removes the re-authorization code.

Bug: 893729
CQ-Depend: CL:*698113
Change-Id: I9ba74e11861baafd36dd92b5cd2be2a2d46e6fa6
Reviewed-on: https://chromium-review.googlesource.com/c/1282028
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600881}