GitLab

This makes the `if` statements in `ApplyPreferences` easier to read.

Bug: none
Test: change a preference and check chrome://histograms shows the sample
Change-Id: I99fdb9ad29d4f6df33444f7b12c20a1a5784f4d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491973Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Harry Cutts <hcutts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826927}