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

chrome/browser/first_run/first_run_linux.cc

Index: chrome/browser/first_run/first_run_linux.cc
diff --git a/chrome/browser/first_run/first_run_linux.cc b/chrome/browser/first_run/first_run_linux.cc
index 54967c687ee19a1187b4721b53e047313003bfb6..160fa6461216accb522fa9e3fa835d1c75556e78 100644
--- a/chrome/browser/first_run/first_run_linux.cc
+++ b/chrome/browser/first_run/first_run_linux.cc
@@ -97,13 +97,12 @@ void AutoImport(
 #endif  // !defined(USE_AURA)
 }
 
-}  // 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