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This CL is a refactor with no intended behavior change.

By moving the settings into components/services/heap_profiling, they will be
usable by Android Webview, which does not compile chrome/

Bug: 827545
Change-Id: I8b217344fcbc259499b5f7622cbfc9b8d21e3e83
Reviewed-on: https://chromium-review.googlesource.com/998017
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548758}