libchrome: Several upstreamable fixes from libchrome

dbus/object_manager.h

Index: dbus/object_manager.h
diff --git a/dbus/object_manager.h b/dbus/object_manager.h
index 266b53eb9a0ac3d140d468114701af3ecad17ba9..1f4e21cc71e8477b2ba36d8e63ce3c54399aaf8c 100644
--- a/dbus/object_manager.h
+++ b/dbus/object_manager.h
@@ -166,8 +166,8 @@ public:
     // called on each interface implementation with differing values of
     // |interface_name| as appropriate. An implementation class will only
     // receive multiple calls if it has registered for multiple interfaces.
-    virtual void ObjectAdded(const ObjectPath& object_path,
-                             const std::string& interface_name) { }
+    virtual void ObjectAdded(const ObjectPath& /* object_path */,
+                             const std::string& /* interface_name */) {}
 
     // Called by ObjectManager to inform the implementation class than an
     // object with the path |object_path| has been removed. Ths D-Bus interface
@@ -178,8 +178,8 @@ public:
     // This method will be called before the Properties structure and the
     // ObjectProxy object for the given interface are cleaned up, it is safe
     // to retrieve them during removal to vary processing.
-    virtual void ObjectRemoved(const ObjectPath& object_path,
-                               const std::string& interface_name) { }
+    virtual void ObjectRemoved(const ObjectPath& /* object_path */,
+                               const std::string& /* interface_name */) {}
   };
 
   // Client code should use Bus::GetObjectManager() instead of this constructor.