Print Preview: Adjust GetDPI() to take input by reference.

Adjust the GetDPI() helper function to take the input by reference
rather than by pointer, since no caller passes in nullptr.

Change-Id: Id96fa0c5f6aeb6622399f0c3b8a9dbba126c8e94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529623
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642194}
1 file changed