[Installer Downloader] Separate pref name and namespace by "."

Change-Id: I050035592820ed012532d437c9322790214fa0b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6574884
Reviewed-by: Kaan Alsan <alsan@chromium.org>
Commit-Queue: Daniel Soromou <koretadaniel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1464180}
diff --git a/chrome/browser/win/installer_downloader/installer_downloader_pref_names.h b/chrome/browser/win/installer_downloader/installer_downloader_pref_names.h
index a99342e9..4eeed1a 100644
--- a/chrome/browser/win/installer_downloader/installer_downloader_pref_names.h
+++ b/chrome/browser/win/installer_downloader/installer_downloader_pref_names.h
@@ -10,7 +10,7 @@
 // Int browser local state that stores how many times the installer downloader
 // inforbar has been shown.
 inline constexpr char kInstallerDownloaderInfobarShowCount[] =
-    "installer_downloader_infobar_show_count";
+    "installer_downloader.infobar_show_count";
 
 }  // namespace installer_downloader::prefs