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This CL removes several memory metrics that are not being used. These are:
  * Memory.{ProcessType}Count
  * Memory.*.Committed
  * Memory.Renderer{Shrink,Growth}In30Min
  * Memory.Swap.*

The memory metrics actively being used and developed are emitted in
ProcessMemoryMetricsEmitter. These are emitted in both UMA and UKM form. The UKM
form implicitly includes ProcessType, though with less granularity. Both the UMA
and UKMs include PrivateMemoryFootprint, a cross-platform consistent metric that
supercedes Memory.*.Committed. There is no replacement for
Memory.Renderer{Shrink,Growth}In30Min.

Bug: 765470
Change-Id: I857f710eeb3ddf233b63be3139ea90ebe8d9a5c9
Reviewed-on: https://chromium-review.googlesource.com/952985Reviewed-by: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Nick Carter <nick@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542144}