Migrated color_mac.mm away from WTF::RetainPtr

Bug: 929973
Change-Id: I2841788eadbfc25a1b2bb9499d72f61677ad2683
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1494669
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#639434}
2 files changed