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Moving it to where the bridges are stored as NotificationImageRetainer
will be used in the NPB Mac UNNotification, making it not unique to
windows builds only.

Bug: 1136930
Change-Id: I496f9295d18665a27d39f8d0aced293a1f076a74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460903
Auto-Submit: Mohamed Adel <adelm@google.com>
Commit-Queue: Mohamed Adel <adelm@google.com>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815684}