Make the v8 Isolate used in the proxy resolver explicit.

chrome/browser/net/proxy_service_factory.h

Index: chrome/browser/net/proxy_service_factory.h
diff --git a/chrome/browser/net/proxy_service_factory.h b/chrome/browser/net/proxy_service_factory.h
index 7bf85cf9df2590e46baeec056b9cd0a41dfea564..8eebf2c7a05f0a0ec02c74fe29e08d3dba519d07 100644
--- a/chrome/browser/net/proxy_service_factory.h
+++ b/chrome/browser/net/proxy_service_factory.h
@@ -25,6 +25,10 @@ class ProxyService;
 class URLRequestContext;
 }  // namespace net
 
+namespace v8 {
+class Isolate;
+}  // namespace v8
+
 class ProxyServiceFactory {
  public:
   // Creates a ProxyConfigService that delivers the system preferences
@@ -48,6 +52,7 @@ class ProxyServiceFactory {
       net::NetLog* net_log,
       net::URLRequestContext* context,
       net::ProxyConfigService* proxy_config_service,
+      v8::Isolate* v8_default_isolate,
       const CommandLine& command_line);
 
  private: