Let chrome_prefs handle Preferences initialization from master_preferences.

chrome/browser/first_run/first_run_internal.h

Index: chrome/browser/first_run/first_run_internal.h
diff --git a/chrome/browser/first_run/first_run_internal.h b/chrome/browser/first_run/first_run_internal.h
index a2fa2612b40dad551a89133a1a2672d6b1155547..a776d87b4d99310d0877bff589a1644b481659b8 100644
--- a/chrome/browser/first_run/first_run_internal.h
+++ b/chrome/browser/first_run/first_run_internal.h
@@ -31,11 +31,6 @@ enum FirstRunState {
 // This variable should only be accessed through IsChromeFirstRun().
 extern FirstRunState first_run_;
 
-// Generates an initial user preference file in |user_data_dir| using the data
-// in |master_prefs|.
-bool GeneratePrefFile(const base::FilePath& user_data_dir,
-                      const installer::MasterPreferences& master_prefs);
-
 // Sets up master preferences by preferences passed by installer.
 void SetupMasterPrefsFromInstallPrefs(
     const installer::MasterPreferences& install_prefs,