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Also performing several other small cleanups
 1) Eliminate usage of CallJavascriptFunctionUnsafe()
 2) Eliminate global setSaveDumpMessage in favor of a WebUI event.
 3) Eliminate global returnProcessList in favor of a Promise.
 4) Remove bad calls to AllowJavascript(). This method should not
    be called within async C++ callbacks.
 5) Add JS type checking.
 6) Move "Refresh" and "Save" button creation in HTML, no need to
    do this in JS.
 7) Remove unnecessary flattenhtml="true" in grd file.

Bug: 1028829
Change-Id: I7841982bef7957b7178171ab50211f93deb1d672
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956446
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759075}