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Previously, DumpProcess would create a full trace, with metadata provided by
ProfilingProcessHost, and write the result to a file. This duplicated
functionality of DumpProcessesForTracing, which uses the Tracing service to
create a fully-fledged trace.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ibca11524f23b7fe8d9808370e05225298a0794a5
Reviewed-on: https://chromium-review.googlesource.com/798152
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521216}