Progressively refacto FirstRun class to first_run namespace(part 4).

chrome/browser/first_run/first_run_win.cc

Index: chrome/browser/first_run/first_run_win.cc
diff --git a/chrome/browser/first_run/first_run_win.cc b/chrome/browser/first_run/first_run_win.cc
index 192cfb464ab537134eeb76ab34a336e84e99f32c..ca0f40bf1b17e8622d4d72731fb467005a03ec73 100644
--- a/chrome/browser/first_run/first_run_win.cc
+++ b/chrome/browser/first_run/first_run_win.cc
@@ -482,13 +482,12 @@ int ImportNow(Profile* profile, const CommandLine& cmdline) {
   return return_code;
 }
 
-}  // namespace first_run
-
-// static
-FilePath FirstRun::MasterPrefsPath() {
+FilePath MasterPrefsPath() {
   // The standard location of the master prefs is next to the chrome binary.
   FilePath master_prefs;
   if (!PathService::Get(base::DIR_EXE, &master_prefs))
     return FilePath();
   return master_prefs.AppendASCII(installer::kDefaultMasterPrefs);
 }
+
+}  // namespace first_run