[spelling] existance to existence

dbus/object_manager.h

Index: dbus/object_manager.h
diff --git a/dbus/object_manager.h b/dbus/object_manager.h
index 842a1378a260c25aa5101985671ba8ee3336c340..c17f1408cda5ed01812665f2c1c52a98c82d69d8 100644
--- a/dbus/object_manager.h
+++ b/dbus/object_manager.h
@@ -211,12 +211,12 @@ public:
 
   // Returns a ObjectProxy pointer for the given |object_path|. Unlike
   // the equivalent method on Bus this will return NULL if the object
-  // manager has not been informed of that object's existance.
+  // manager has not been informed of that object's existence.
   ObjectProxy* GetObjectProxy(const ObjectPath& object_path);
 
   // Returns a PropertySet* pointer for the given |object_path| and
   // |interface_name|, or NULL if the object manager has not been informed of
-  // that object's existance or the interface's properties. The caller should
+  // that object's existence or the interface's properties. The caller should
   // cast the returned pointer to the appropriate type, e.g.:
   //   static_cast<Properties*>(GetProperties(object_path, my_interface));
   PropertySet* GetProperties(const ObjectPath& object_path,