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Since we access external websites when sending GA metrics, it should be
extracted to untrusted context.

Bug: 980846
Test: Send GA metrics on CCA and both version (Platform App/SWA) works
normally

Change-Id: I14702129e4301327fd8a918d716420acbb43a94c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352263
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Inker Kuo <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822522}