Fix URLRequestContext::CopyFrom in ios code

ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm

Index: ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm b/ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm
index 26b0cf947c5ff12eebf19b9b73fdf2012328ddb3..e8c9434d7f49416bcd9cb478e05155aea0f9d072 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm
+++ b/ios/chrome/browser/browser_state/chrome_browser_state_impl_io_data.mm
@@ -416,11 +416,23 @@ ChromeBrowserStateImplIOData::InitializeAppRequestContext(
   AppRequestContext* context = new AppRequestContext();
   context->CopyFrom(main_context);
 
+  // Use a separate ChannelIDService.
+  std::unique_ptr<net::ChannelIDService> channel_id_service(
+      new net::ChannelIDService(new net::DefaultChannelIDStore(nullptr),
+                                base::WorkerPool::GetTaskRunner(true)));
+
+  // Build a new HttpNetworkSession that uses the new ChannelIDService.
+  net::HttpNetworkSession::Params network_params =
+      http_network_session_->params();
+  network_params.channel_id_service = channel_id_service.get();
+  std::unique_ptr<net::HttpNetworkSession> http_network_session(
+      new net::HttpNetworkSession(network_params));
+
   // Use a separate HTTP disk cache for isolated apps.
   std::unique_ptr<net::HttpCache::BackendFactory> app_backend =
       net::HttpCache::DefaultBackend::InMemory(0);
   std::unique_ptr<net::HttpCache> app_http_cache =
-      CreateHttpFactory(http_network_session_.get(), std::move(app_backend));
+      CreateHttpFactory(http_network_session.get(), std::move(app_backend));
 
   cookie_util::CookieStoreConfig ios_cookie_config(
       base::FilePath(),
@@ -429,7 +441,10 @@ ChromeBrowserStateImplIOData::InitializeAppRequestContext(
   std::unique_ptr<net::CookieStore> cookie_store =
       cookie_util::CreateCookieStore(ios_cookie_config);
 
-  // Transfer ownership of the cookies and cache to AppRequestContext.
+  // Transfer ownership of the ChannelIDStore, HttpNetworkSession, cookies, and
+  // cache to AppRequestContext.
+  context->SetChannelIDService(std::move(channel_id_service));
+  context->SetHttpNetworkSession(std::move(http_network_session));
   context->SetCookieStore(std::move(cookie_store));
   context->SetHttpTransactionFactory(std::move(app_http_cache));