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Adds a NetworkIsolationKey to the requests so that they are still
cached when the split cache config is enabled. We set the is_trusted
param for a URLLoaderFactory in a safe browsing or system network
context as it was previously left unset.

Bug: 1003883
Change-Id: I6e93980c6034b11e11b6ab2a0620b377c6c8caa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803873Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Nathan Parker <nparker@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697226}