Mojo bindings environment: remove usage in mojo/edk/js

mojo/message_pump/handle_watcher.h

Index: mojo/message_pump/handle_watcher.h
diff --git a/mojo/message_pump/handle_watcher.h b/mojo/message_pump/handle_watcher.h
index d855e45ea47dd60d2c70e3795e92cf428388188a..18211ca81eea5a635821f63c9068a7e4b850eb22 100644
--- a/mojo/message_pump/handle_watcher.h
+++ b/mojo/message_pump/handle_watcher.h
@@ -45,6 +45,8 @@ class MOJO_MESSAGE_PUMP_EXPORT HandleWatcher {
   // Stops listening. Does nothing if not in the process of listening.
   void Stop();
 
+  bool is_watching() const { return !!state_; }
+
  private:
   class StateBase;
   class SameThreadWatchingState;