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Fix histogram names that got swapped around during a refactoring.

Change-Id: I8f680a9c0ae28ab287656fea1981f26bd338f712
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904540
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Auto-Submit: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713662}