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This CL converts MemoryPressureControllerPtr and
MemoryPressureControllerRequest to new Mojo types.

Bug: 955171
Change-Id: I84464e08ac4be2c3051343a65160b4c02062cc13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788963
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695891}