Make the v8 Isolate used in the proxy resolver explicit.

chrome/browser/net/connection_tester.h

Index: chrome/browser/net/connection_tester.h
diff --git a/chrome/browser/net/connection_tester.h b/chrome/browser/net/connection_tester.h
index d25c266b691b4c7a113b122a2d38dfe3998491d5..49bf4aa8b669332bba04097de0cab47556426f9d 100644
--- a/chrome/browser/net/connection_tester.h
+++ b/chrome/browser/net/connection_tester.h
@@ -17,6 +17,10 @@ class NetLog;
 class URLRequestContext;
 }  // namespace net
 
+namespace v8 {
+class Isolate;
+}  // namespace v8
+
 // ConnectionTester runs a suite of tests (also called "experiments"),
 // to try and discover why loading a particular URL is failing with an error
 // code.
@@ -130,7 +134,8 @@ class ConnectionTester {
   // of ConnectionTester.
   ConnectionTester(Delegate* delegate,
                    net::URLRequestContext* proxy_request_context,
-                   net::NetLog* net_log);
+                   net::NetLog* net_log,
+                   v8::Isolate* v8_default_isolate);
 
   // Note that destruction cancels any in-progress tests.
   ~ConnectionTester();
@@ -180,6 +185,8 @@ class ConnectionTester {
 
   net::NetLog* net_log_;
 
+  v8::Isolate* v8_default_isolate_;
+
   DISALLOW_COPY_AND_ASSIGN(ConnectionTester);
 };