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On macOS versions running versions below 10.10 images did not conform to
NSSecureCoding protocol. Now that Chrome only supports macOS 10.10+ this
check is unnecessary.

Bug: None
Change-Id: Ief414b6e6e7f183b2e9e2b5065231579b92578e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494873Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Mohamed Adel <adelm@google.com>
Cr-Commit-Position: refs/heads/master@{#820321}