Cleanup usage of canonical_suffixes in HttpServerPropertiesImpl

net/http/http_server_properties_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 51 matching lines @@
 
   // Get the list of servers (host/port) that support SPDY. The max_size is the
   // number of MRU servers that support SPDY that are to be returned.
   void GetSpdyServerList(base::ListValue* spdy_server_list,
                          size_t max_size) const;
 
   // Returns flattened string representation of the |host_port_pair|. Used by
   // unittests.
   static std::string GetFlattenedSpdyServer(const HostPortPair& host_port_pair);
 
-  // Returns the canonical host suffix for |host|, or std::string() if none
+  // Returns the canonical host suffix for |host|, or nullptr if none
   // exists.
-  std::string GetCanonicalSuffix(const std::string& host);
+  const std::string* GetCanonicalSuffix(const std::string& host) const;
 
   // -----------------------------
   // HttpServerProperties methods:
   // -----------------------------
 
   base::WeakPtr<HttpServerProperties> GetWeakPtr() override;
   void Clear() override;
   bool SupportsRequestPriority(const url::SchemeHostPort& server) override;
   bool GetSupportsSpdy(const url::SchemeHostPort& server) override;
   void SetSupportsSpdy(const url::SchemeHostPort& server,
@@ skipping 104 matching lines @@
   size_t max_server_configs_stored_in_properties_;
 
   base::WeakPtrFactory<HttpServerPropertiesImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_