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This CL removes uvm extension support and corresponding counters for
registration at blink layer.

This is the second CL for removing uvm for registration.
The first CL:
https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/1504071

Bug: 986345
Change-Id: Idf74c8a6343609120ac596fd86d2c8d5c7861cb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710143Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Suzy Li <suzyli@google.com>
Cr-Commit-Position: refs/heads/master@{#681123}