Support variations_seed parameter in MasterPrefs.

chrome/installer/util/master_preferences.cc

Index: chrome/installer/util/master_preferences.cc
===================================================================
--- chrome/installer/util/master_preferences.cc	(revision 181784)
+++ chrome/installer/util/master_preferences.cc	(working copy)
@@ -12,6 +12,7 @@
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/common/env_vars.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/installer/util/master_preferences_constants.h"
 #include "chrome/installer/util/util_constants.h"
 #include "googleurl/src/gurl.h"
@@ -314,6 +315,12 @@
       master_preferences::kExtensionsBlock, extensions);
 }
 
+std::string MasterPreferences::GetVariationsSeed() const {
+  std::string variations_seed;
+  master_dictionary_->GetString(prefs::kVariationsSeed, &variations_seed);
+  return variations_seed;
+}
+
 // static
 const MasterPreferences& MasterPreferences::ForCurrentProcess() {
   return g_master_preferences.Get();