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This CL continues to remove asserts from AssertMatchingEnums.cpp and
place them in files nearer their internal definitions.

Bug: 712963
Change-Id: I8cda3922744b053ecbbcb5b6c94a685f419defa4
Reviewed-on: https://chromium-review.googlesource.com/597382
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491313}