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This is a reland of f9ad6770

In the previous commit, the flag was overriden only for Windows.
But the flag is set to true in case of MacOS too.

Original change's description:
> Fix ExtensionPolicyTest.ExtensionRecommendedInstallationMode browsertest
>
> We check the list of enabled and disabled extensions in
> ExtensionPolicyTest.ExtensionRecommendedInstallationMode browsertest.
> In Windows, the extension is disabled by default as the user is
> prompted before enabling the extension. On other platforms, the
> extension is enabled by default. This CL overrides the prompting
> flag to false.
>
> Bug: 1006342
> Change-Id: I1d783a8fc381b50e84e5ba85b5c9f37e58b7a986
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537641
> Reviewed-by: Sergey Poromov <poromov@chromium.org>
> Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
> Cr-Commit-Position: refs/heads/master@{#828093}

Bug: 1006342
Change-Id: If01e0d818a2b0a1e0f8704852aee5ac478c301ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544292Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Cr-Commit-Position: refs/heads/master@{#828205}