Deprecate the version of Context::New which returns a Persistent.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 3a86e86e020cbc9448c50f2ccd21476035a66c2e..a5562fe527a7a65546298ce3bbe1a5482033cf81 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4609,11 +4609,10 @@ class V8EXPORT Context {
       Handle<Value> global_object = Handle<Value>());
 
   /** Deprecated. Use Isolate version instead. */
-  // TODO(mstarzinger): Put this behind the V8_DEPRECATED guard.
-  static Persistent<Context> New(
+  V8_DEPRECATED(static Persistent<Context> New(
       ExtensionConfiguration* extensions = NULL,
       Handle<ObjectTemplate> global_template = Handle<ObjectTemplate>(),
-      Handle<Value> global_object = Handle<Value>());
+      Handle<Value> global_object = Handle<Value>()));
 
   /** Returns the last entered context. */
   static Local<Context> GetEntered();