Make the v8 Isolate used in the proxy resolver explicit.

net/proxy/proxy_service_v8.h

Index: net/proxy/proxy_service_v8.h
diff --git a/net/proxy/proxy_service_v8.h b/net/proxy/proxy_service_v8.h
index 0ff574d20dea5d111d42a40ba4bed1adf2559e6d..3dc94f7bf1f15ae9a13a2613f02b6c40d1ed3f35 100644
--- a/net/proxy/proxy_service_v8.h
+++ b/net/proxy/proxy_service_v8.h
@@ -8,6 +8,10 @@
 #include "base/basictypes.h"
 #include "net/base/net_export.h"
 
+namespace v8 {
+class Isolate;
+}  // namespace v8
+
 namespace net {
 
 class DhcpProxyScriptFetcher;
@@ -59,7 +63,8 @@ NET_EXPORT ProxyService* CreateProxyServiceUsingV8ProxyResolver(
     DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher,
     HostResolver* host_resolver,
     NetLog* net_log,
-    NetworkDelegate* network_delegate);
+    NetworkDelegate* network_delegate,
+    v8::Isolate* v8_default_isolate);
 
 }  // namespace net