scanning: Use local time in filenames

Instead of using UTC timestamps in the filenames of scanned images, use
local time.

Bug: 1059779
Change-Id: I163e1181a5b8c0412d9930f3c11f8f219bc15c28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469137
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816785}

chrome/browser/chromeos/scanning/scan_service.cc

@@ -59,7 +59,7 @@ void ScanService::Scan(const base::UnguessableToken& scanner_id,
   if (scanner_name.empty())
     std::move(callback).Run(false);
 
-  base::Time::Now().UTCExplode(&start_time_);
+  base::Time::Now().LocalExplode(&start_time_);
   save_failed_ = false;
   lorgnette_scanner_manager_->Scan(
       scanner_name, mojo::ConvertTo<lorgnette::ScanSettings>(settings),