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Share some of the helper macros from MediaLogProperties with these two
new types in the media_log_type_enforcement.h file, which replaces
media_log_properties_helper.h

Bug: 794255
Change-Id: I7c709c5ac881b3bf03ba327d850e0c58824cec57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006130
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732672}