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

content/renderer/chrome_object_extensions_utils.cc

Index: content/renderer/chrome_object_extensions_utils.cc
diff --git a/content/renderer/chrome_object_extensions_utils.cc b/content/renderer/chrome_object_extensions_utils.cc
index b9c3cdebba2adbd845972f8e4d1198b22bd7c1eb..fe78ecc26d5b0a3bddfc18179b88b074932e70ed 100644
--- a/content/renderer/chrome_object_extensions_utils.cc
+++ b/content/renderer/chrome_object_extensions_utils.cc
@@ -18,7 +18,7 @@ v8::Handle<v8::Object> GetOrCreateChromeObject(
     chrome = v8::Object::New(isolate);
     global->Set(gin::StringToSymbol(isolate, "chrome"), chrome);
   } else {
-    chrome = chrome_value->ToObject();
+    chrome = v8::Handle<v8::Object>::Cast(chrome_value);
   }
   return chrome;
 }