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This CL removes unused code. It has no intended behavior change.

The out of process heap profiler [see components/heap_profiling and
components/services/heap_profiling] has replaced the legacy heap profiler.

This CL removes the implementation and allocator hooks. Future CLs will remove
the plumbing to enable/disable legacy heap profiler.

Bug: 822843
Change-Id: I79e320c3f17bacf2414c5d0815b5feb4288de7d7
Reviewed-on: https://chromium-review.googlesource.com/1066576
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Siddhartha S <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560757}