messageHandlerInMainThread should return immediately if there is no entered window

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
index f1363a1dab40481862f6c971bd07b950a2c70ad7..901a73831f44c4cf0eb827f20b37b63c7c53521e 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
@@ -676,6 +676,10 @@ LocalDOMWindow* enteredDOMWindow(v8::Isolate* isolate)
         // We don't always have an entered DOM window, for example during microtask callbacks from V8
         // (where the entered context may be the DOM-in-JS context). In that case, we fall back
         // to the current context.
+        //
+        // TODO(haraken): It's nasty to return a current window from enteredDOMWindow.
+        // All call sites should be updated so that it works even if it doesn't have
+        // an entered window.
         window = currentDOMWindow(isolate);
         ASSERT(window);
     }