[Sync] Made some sync session member functions const

chrome/browser/sync/sessions/sync_session_context.h

 // Copyright (c) 2011 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.
 
 // SyncSessionContext encapsulates the contextual information and engine
 // components specific to a SyncSession. A context is accessible via
 // a SyncSession so that session SyncerCommands and parts of the engine have
 // a convenient way to access other parts. In this way it can be thought of as
 // the surrounding environment for the SyncSession. The components of this
 // environment are either valid or not valid for the entire context lifetime,
@@ skipping 65 matching lines @@
   void set_notifications_enabled(bool enabled) {
     notifications_enabled_ = enabled;
   }
   bool notifications_enabled() { return notifications_enabled_; }
 
   // Account name, set once a directory has been opened.
   void set_account_name(const std::string name) {
     DCHECK(account_name_.empty());
     account_name_ = name;
   }
-  const std::string& account_name() { return account_name_; }
+  const std::string& account_name() const { return account_name_; }
 
   void set_max_commit_batch_size(int batch_size) {
     max_commit_batch_size_ = batch_size;
   }
   int32 max_commit_batch_size() const { return max_commit_batch_size_; }
 
   const ModelSafeRoutingInfo& previous_session_routing_info() const {
     return previous_session_routing_info_;
   }
 
@@ skipping 72 matching lines @@
  private:
   SyncSessionContext* context_;
   ConflictResolver* resolver_;
   DISALLOW_COPY_AND_ASSIGN(ScopedSessionContextConflictResolver);
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_CONTEXT_H_