Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/chrome/browser/sessions/session_service_unittest.mm

 // Copyright 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.
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 113 matching lines @@
 TEST_F(SessionServiceTest, LoadWindowFromDirectory) {
   SessionServiceIOS* service = [SessionServiceIOS sharedService];
   base::scoped_nsobject<SessionWindowIOS> origSessionWindow(
       [[SessionWindowIOS alloc] init]);
   [service performSaveWindow:origSessionWindow toDirectory:directoryName_];
 
   SessionWindowIOS* sessionWindow =
       [service loadWindowForBrowserState:chrome_browser_state_.get()];
   EXPECT_TRUE(sessionWindow != nil);
   EXPECT_EQ(NSNotFound, static_cast<NSInteger>(sessionWindow.selectedIndex));
-  EXPECT_EQ(0U, sessionWindow.unclaimedSessions);
+  EXPECT_EQ(0U, sessionWindow.sessions.count);
 }
 
 TEST_F(SessionServiceTest, LoadCorruptedWindow) {
   SessionWindowIOS* sessionWindow =
       LoadSessionFromTestDataFile(FILE_PATH_LITERAL("corrupted.plist"));
   EXPECT_TRUE(sessionWindow == nil);
 }
 
 }  // anonymous namespace