gin: Bug fix: Fix CreateHandle to return an emtpy handle in some extreme cases

gin/wrappable.cc

Index: gin/wrappable.cc
diff --git a/gin/wrappable.cc b/gin/wrappable.cc
index 8d41ce06c4dfc4b5abb0a08b50f5ac84929777c2..a330fefc8e89bb7071c7d592bdb708adc74ec1a7 100644
--- a/gin/wrappable.cc
+++ b/gin/wrappable.cc
@@ -44,6 +44,14 @@ v8::Handle<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
   }
   CHECK_EQ(kNumberOfInternalFields, templ->InternalFieldCount());
   v8::Handle<v8::Object> wrapper = templ->NewInstance();
+  // |wrapper| may be empty in some extreme cases, e.g., when
+  // Object.prototype.constructor is overwritten.
+  if (wrapper.IsEmpty()) {
+    // The current wrappable object will be no longer managed by V8. Delete this
+    // now.
+    delete this;
+    return wrapper;
+  }
   wrapper->SetAlignedPointerInInternalField(kWrapperInfoIndex, info);
   wrapper->SetAlignedPointerInInternalField(kEncodedValueIndex, this);
   wrapper_.Reset(isolate, wrapper);