Set CRWSessionController's BrowserState when NavigationManger's is set.

ios/web/navigation/crw_session_controller.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 "ios/web/navigation/crw_session_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 223 matching lines @@
     // _browserState will be nullptr if CRWSessionController has been
     // initialized with -initWithCoder: method. Take _browserState from
     // NavigationManagerImpl if that's the case.
     if (!_browserState) {
       _browserState = _navigationManager->GetBrowserState();
     }
     DCHECK_EQ(_browserState, _navigationManager->GetBrowserState());
   }
 }
 
+- (void)setBrowserState:(web::BrowserState*)browserState {
+  _browserState = browserState;
+  DCHECK(!_navigationManager ||
+         _navigationManager->GetBrowserState() == _browserState);
+}
+
 - (NSString*)description {
   return [NSString
       stringWithFormat:
           @"id: %@\nname: %@\nlast visit: %f\ncurrent index: %" PRIdNS
           @"\nprevious index: %" PRIdNS @"\npending index: %" PRIdNS
                                         @"\n%@\npending: %@\ntransient: %@\n",
           _tabId, self.windowName, _lastVisitedTimestamp,
           _currentNavigationIndex, _previousNavigationIndex, _pendingEntryIndex,
           _entries, _pendingEntry.get(), _transientEntry.get()];
 }
@@ skipping 431 matching lines @@
   return [[CRWSessionEntry alloc] initWithNavigationItem:std::move(item)];
 }
 
 - (BOOL)isRedirectTransitionForEntryAtIndex:(NSInteger)index {
   ui::PageTransition transition =
       [_entries[index] navigationItem]->GetTransitionType();
   return (transition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK) ? YES : NO;
 }
 
 @end