[Cronet] Enable persistence mode for Sdch

net/base/sdch_manager_unittest.cc

Index: net/base/sdch_manager_unittest.cc
diff --git a/net/base/sdch_manager_unittest.cc b/net/base/sdch_manager_unittest.cc
index ba3248e3de8601c3b5701b4ac21c4376a55fb4df..7d3e0cd87fcbfb4995187a75f7a4e06640df1996 100644
--- a/net/base/sdch_manager_unittest.cc
+++ b/net/base/sdch_manager_unittest.cc
@@ -50,6 +50,11 @@ class MockSdchObserver : public SdchObserver {
   }
 
   // SdchObserver implementation
+  void OnDictionaryAdded(SdchManager* /* manager */,
+                         const GURL& /* dictionary_url */,
+                         const std::string& /* server_hash */) override {}
+  void OnDictionaryRemoved(SdchManager* /* manager */,
+                           const std::string& /* server_hash */) override {}
   void OnDictionaryUsed(SdchManager* manager,
                         const std::string& server_hash) override {
     last_server_hash_ = server_hash;