SdchObserver: add OnDictionary{Added,Removed}

net/filter/sdch_filter_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1227 matching lines @@
   // SdchObserver
   void OnDictionaryUsed(SdchManager* manager,
                         const std::string& server_hash) override {
     dictionary_used_++;
     last_server_hash_ = server_hash;
   }
 
   int dictionary_used_calls() const { return dictionary_used_; }
   std::string last_server_hash() const { return last_server_hash_; }
 
+  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 OnGetDictionary(SdchManager* /* manager */,
                        const GURL& /* request_url */,
                        const GURL& /* dictionary_url */) override {}
   void OnClearDictionaries(SdchManager* /* manager */) override {}
 
  private:
   int dictionary_used_;
   std::string last_server_hash_;
   SdchManager* manager_;
 
@@ skipping 33 matching lines @@
 
   filter.reset(nullptr);
 
   // Confirm that we got a "DictionaryUsed" signal from the SdchManager
   // for our dictionary.
   EXPECT_EQ(1, observer.dictionary_used_calls());
   EXPECT_EQ(server_hash, observer.last_server_hash());
 }
 
 }  // namespace net