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This is a reland of a8a9ff46

Only change from original CL is to remove the macOS sandbox changes.

Original change's description:
> Run v8 in proxy resolver in jitless mode.
>
> This allows MITIGATION_DYNAMIC_CODE_DISABLE to be enabled for the
> process on Windows, and moves PAC resolver from the Renderer helper
> variant to the Default helper variant on macOS.
>
> BUG=961831,961592
>
> Change-Id: I90f9dc69fa5ebf43f71b0395d7d2217fc24181b5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051153
> Commit-Queue: Will Harris <wfh@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#741531}

Bug: 961831, 961592, 1052853
Change-Id: I847f3987ca2c21cd4999bd9c226261223ef045d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064588Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744784}