Convert ios/web/favicon js_compile_bundle targets

Converts favicon JavaScript targets to be compiled with Rollup and
Terser instead of the closure compiler.

Additionally, removes the outer anonymous function which is now
redundant as the JavaScript produced by optimize_js always wraps the
resulting script in an anonymous function.

Bug: 1313654
Change-Id: I8b3f169bfdb5e7a809b27c7eee85adc95eb16f78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3588037
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/main@{#992882}