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I included overloads for setting the source scheme with either a boolean
or the scheme string itself.

I refacted other similar utility functions in cookie_util.cc to reuse
this new function as well.

Bug: 1102874
Change-Id: I879ea6534f65ab54d4374fb768a751115e68471b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285244Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Cr-Commit-Position: refs/heads/master@{#786049}