Add ProxyResolverFactoryV8Tracing.

net/data/proxy_resolver_v8_tracing_unittest/error_on_load.js

Index: net/data/proxy_resolver_v8_tracing_unittest/error_on_load.js
diff --git a/extensions/renderer/injection_host.cc b/net/data/proxy_resolver_v8_tracing_unittest/error_on_load.js
similarity index 50%
copy from extensions/renderer/injection_host.cc
copy to net/data/proxy_resolver_v8_tracing_unittest/error_on_load.js
index 30e8679de88b42f75d0f92a7cd9cc6fe165750e2..2379bbfe102fc180f40c8b5800c67c66e56c59ae 100644
--- a/extensions/renderer/injection_host.cc
+++ b/net/data/proxy_resolver_v8_tracing_unittest/error_on_load.js
@@ -2,11 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "extensions/renderer/injection_host.h"
+alert('Prepare to DIE!');
+var x = null;
+return x.split('-');  // Throws exception.
 
-InjectionHost::InjectionHost(const HostID& host_id) :
-    id_(host_id) {
-}
-
-InjectionHost::~InjectionHost() {
+function FindProxyForURL(url, host) {
+  return "PROXY i-approve-this-message:42";
 }