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This event is extremely frequent and contributes heavily to trace
size bloat, which is negatively affecting a lot of the testing
infrastructure. Reducing the size of the event and removing the args
which are not useful in this case.

R=gab@chromium.org
BUG=902064

Change-Id: Id7d0ecba3ed084f5ef30d7a29554b14c6a68b963
Reviewed-on: https://chromium-review.googlesource.com/c/1330067
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608958}