remove some calls to to-be-deprecated v8::Value::To* functions

chrome/renderer/benchmarking_extension.cc

Index: chrome/renderer/benchmarking_extension.cc
diff --git a/chrome/renderer/benchmarking_extension.cc b/chrome/renderer/benchmarking_extension.cc
index d8372d8f2fe9370f5a61d953809f823b39958831..f7fe37d51f11aa61c1ca949a2456e1758046c3bb 100644
--- a/chrome/renderer/benchmarking_extension.cc
+++ b/chrome/renderer/benchmarking_extension.cc
@@ -86,7 +86,7 @@ class BenchmarkingWrapper : public v8::Extension {
       size_t capacity) {
     name[0] = 'c';
     name[1] = ':';
-    args[0]->ToString()->WriteUtf8(&name[2], capacity - 3);
+    args[0]->ToString(args.GetIsolate())->WriteUtf8(&name[2], capacity - 3);
   }
 
   static void GetCounter(const v8::FunctionCallbackInfo<v8::Value>& args) {