[Sync] Convert SyncSessionSnapshot to a copy-able class.

chrome/browser/sync/profile_sync_service_mock.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 CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_MOCK_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_MOCK_H_
 #pragma once
 
 #include <string>
 
@@ skipping 56 matching lines @@
   MOCK_CONST_METHOD0(HasSyncSetupCompleted, bool());
 
   MOCK_CONST_METHOD0(EncryptEverythingEnabled, bool());
   MOCK_METHOD0(EnableEncryptEverything, void());
 
   MOCK_METHOD1(ChangePreferredDataTypes,
                void(syncable::ModelTypeSet preferred_types));
   MOCK_CONST_METHOD0(GetPreferredDataTypes, syncable::ModelTypeSet());
   MOCK_CONST_METHOD0(GetRegisteredDataTypes, syncable::ModelTypeSet());
   MOCK_CONST_METHOD0(GetLastSessionSnapshot,
-                     const browser_sync::sessions::SyncSessionSnapshot*());
+                     browser_sync::sessions::SyncSessionSnapshot());
 
   MOCK_METHOD0(QueryDetailedSyncStatus,
                browser_sync::SyncBackendHost::Status());
   MOCK_CONST_METHOD0(GetAuthError, const GoogleServiceAuthError&());
   MOCK_CONST_METHOD0(FirstSetupInProgress, bool());
   MOCK_CONST_METHOD0(GetLastSyncedTimeString, string16());
   MOCK_CONST_METHOD0(unrecoverable_error_detected, bool());
   MOCK_CONST_METHOD0(sync_initialized, bool());
   MOCK_CONST_METHOD0(waiting_for_auth, bool());
   MOCK_METHOD1(OnActionableError, void(
       const browser_sync::SyncProtocolError&));
 
   MOCK_METHOD0(AreCredentialsAvailable, bool());
 
   MOCK_CONST_METHOD0(IsPassphraseRequired, bool());
   MOCK_CONST_METHOD0(IsPassphraseRequiredForDecryption, bool());
   MOCK_CONST_METHOD0(IsUsingSecondaryPassphrase, bool());
 
   MOCK_METHOD1(SetDecryptionPassphrase, bool(const std::string& passphrase));
   MOCK_METHOD2(SetEncryptionPassphrase, void(const std::string& passphrase,
                                              PassphraseType type));
 
   MOCK_METHOD0(ShowErrorUI, void());
 };
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_MOCK_H_