Refactor serialisation of openerId & openerNavigationIndex.

ios/chrome/browser/tabs/tab_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 <UIKit/UIKit.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 178 matching lines @@
         chrome_browser_state_.get(), ServiceAccessType::EXPLICIT_ACCESS);
 
     ios::ChromeBrowserState* browser_state = chrome_browser_state_.get();
     if (UseOffTheRecordBrowserState())
       browser_state = browser_state->GetOffTheRecordChromeBrowserState();
 
     mock_web_controller_ =
         [OCMockObject niceMockForClass:[CRWWebController class]];
     auto web_state_impl = base::MakeUnique<WebStateImpl>(browser_state);
     web_state_impl->SetWebController(mock_web_controller_);
-    web_state_impl->GetNavigationManagerImpl().InitializeSession(
-        @"window1", @"opener", NO, 0);
+    web_state_impl->GetNavigationManagerImpl().InitializeSession(@"window1",
+                                                                 NO);
     web_state_impl_ = web_state_impl.get();
     [[[static_cast<OCMockObject*>(mock_web_controller_) stub]
         andReturnValue:OCMOCK_VALUE(web_state_impl_)] webStateImpl];
     web_controller_view_.reset([[UIView alloc] init]);
     [[[static_cast<OCMockObject*>(mock_web_controller_) stub]
         andReturn:web_controller_view_.get()] view];
     tab_.reset([[Tab alloc] initWithWebState:std::move(web_state_impl)
                                        model:nil
                             attachTabHelpers:NO]);
     web::NavigationManager::WebLoadParams params(GURL("chrome://version/"));
@@ skipping 341 matching lines @@
       [[FakeNativeAppMetadata alloc] init]);
 
   // Turn auto open on.
   [metadata setShouldAutoOpenLinks:YES];
   int expectedCallCount = 2;
   TestOpenNativeAppURL(testURL, NO, expectedCallCount, NO);
   EXPECT_FALSE([metadata shouldAutoOpenLinks]);
 }
 
 }  // namespace