Moved |openedByDOM| to WebState's CreateParams and public interface.

ios/web/public/test/web_test_with_web_state.mm

Index: ios/web/public/test/web_test_with_web_state.mm
diff --git a/ios/web/public/test/web_test_with_web_state.mm b/ios/web/public/test/web_test_with_web_state.mm
index 9b09c9e1183b105e55860c0ce93a9e9a2e7609df..9ee621e25276d62409c556f40ac4e203b2dc5f8d 100644
--- a/ios/web/public/test/web_test_with_web_state.mm
+++ b/ios/web/public/test/web_test_with_web_state.mm
@@ -29,13 +29,12 @@
 
 void WebTestWithWebState::SetUp() {
   WebTest::SetUp();
-  std::unique_ptr<WebStateImpl> web_state(new WebStateImpl(GetBrowserState()));
-  web_state->GetNavigationManagerImpl().InitializeSession(NO);
-  web_state->SetWebUsageEnabled(true);
-  web_state_.reset(web_state.release());
+  web::WebState::CreateParams params(GetBrowserState());
+  web_state_ = web::WebState::Create(params);
+  web_state_->SetWebUsageEnabled(true);
 
   // Force generation of child views; necessary for some tests.
-  [GetWebController(web_state_.get()) triggerPendingLoad];
+  [GetWebController(web_state()) triggerPendingLoad];
 }
 
 void WebTestWithWebState::TearDown() {