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[iOS] Update secure icon to make consistent with other platforms

Before: https://drive.google.com/file/d/1D9OunuuOxV5O9FWTnU0MKMpn6hkeop8_/view?usp=sharing
After: https://drive.google.com/file/d/1R-O4UNXMCG-e_wHnN4sH3M92QhvLhpKj/view?usp=sharing

Change-Id: Ia2a96b5eeb977ef58479ac6ebfc9106d7dd62304
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304093Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790455}