Fix bug: AppShell: CHECK failure in PeerConnection init.

content/shell/browser/shell_url_request_context_getter.cc

Index: content/shell/browser/shell_url_request_context_getter.cc
diff --git a/content/shell/browser/shell_url_request_context_getter.cc b/content/shell/browser/shell_url_request_context_getter.cc
index c606d13cba040da14893d3af6cbb154097a0c33b..4788d28156917ee1f3652d2dfc78bdfd671b9f92 100644
--- a/content/shell/browser/shell_url_request_context_getter.cc
+++ b/content/shell/browser/shell_url_request_context_getter.cc
@@ -91,6 +91,10 @@ ShellURLRequestContextGetter::ShellURLRequestContextGetter(
 ShellURLRequestContextGetter::~ShellURLRequestContextGetter() {
 }
 
+net::NetworkDelegate* ShellURLRequestContextGetter::CreateNetworkDelegate() {
+  return new ShellNetworkDelegate;
+}
+
 net::URLRequestContext* ShellURLRequestContextGetter::GetURLRequestContext() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
@@ -99,7 +103,7 @@ net::URLRequestContext* ShellURLRequestContextGetter::GetURLRequestContext() {
 
     url_request_context_.reset(new net::URLRequestContext());
     url_request_context_->set_net_log(net_log_);
-    network_delegate_.reset(new ShellNetworkDelegate);
+    network_delegate_.reset(CreateNetworkDelegate());
     if (command_line.HasSwitch(switches::kDumpRenderTree))
       ShellNetworkDelegate::SetAcceptAllCookies(false);
     url_request_context_->set_network_delegate(network_delegate_.get());