[Cleanup] Remove the obsolete variations_seed pref.

chrome/installer/util/master_preferences.cc

Index: chrome/installer/util/master_preferences.cc
diff --git a/chrome/installer/util/master_preferences.cc b/chrome/installer/util/master_preferences.cc
index 223aa320065ed7e21a75fa02eccc24cefa8d1d8f..8820718e73d6915b3e693510bac0238ab385dc05 100644
--- a/chrome/installer/util/master_preferences.cc
+++ b/chrome/installer/util/master_preferences.cc
@@ -295,10 +295,6 @@ std::string MasterPreferences::GetCompressedVariationsSeed() const {
   return ExtractPrefString(variations::prefs::kVariationsCompressedSeed);
 }
 
-std::string MasterPreferences::GetVariationsSeed() const {
-  return ExtractPrefString(variations::prefs::kVariationsSeed);
-}
-
 std::string MasterPreferences::GetVariationsSeedSignature() const {
   return ExtractPrefString(variations::prefs::kVariationsSeedSignature);
 }