Enable -Wimplicit-retain-self for //ios/web_view:web_view_sources

Bug: 1198927
Change-Id: I400bfd311ff89dafbc0470e03b6c7e84ffb995b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2826239
Commit-Queue: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#874732}
GitOrigin-RevId: 177cb3f817d88408ab2e2ef4f245e1225533deba
2 files changed