If SDCH is disabled, don't add an SDCH filter

net/filter/filter.cc

Index: net/filter/filter.cc
diff --git a/net/filter/filter.cc b/net/filter/filter.cc
index 93583c1e6ef6609e8fd298b73ff186c0cf7e162b..244abaea10eead6e52ac95e5b52af3862c6f64ff 100644
--- a/net/filter/filter.cc
+++ b/net/filter/filter.cc
@@ -369,7 +369,10 @@ Filter* Filter::PrependNewFilter(FilterType type_id,
       break;
     case FILTER_TYPE_SDCH:
     case FILTER_TYPE_SDCH_POSSIBLE:
-      first_filter.reset(InitSdchFilter(type_id, filter_context, buffer_size));
+      if (SdchManager::Global() && SdchManager::sdch_enabled()) {
+        first_filter.reset(
+            InitSdchFilter(type_id, filter_context, buffer_size));
+      }
       break;
     default:
       break;