Remove TODO in PPAPI input event interface files.

ppapi/api/ppb_input_event.idl

Index: ppapi/api/ppb_input_event.idl
diff --git a/ppapi/api/ppb_input_event.idl b/ppapi/api/ppb_input_event.idl
index 03d5d70d792c2356d9c968afdc0d62ab48321db7..7067cbfd175f3e73bd909b3d70689212e6192831 100644
--- a/ppapi/api/ppb_input_event.idl
+++ b/ppapi/api/ppb_input_event.idl
@@ -532,10 +532,6 @@ interface PPB_MouseInputEvent {
    *
    * @return The change in position of the mouse, relative to the previous
    * position.
-   *
-   * TODO(yzshen): This feature hasn't been fully supported yet. For now,
-   * movement information is provided only if the mouse is locked. If the mouse
-   * is not locked, the returned value is (0, 0).
    */
   [version=1.1]
   PP_Point GetMovement([in] PP_Resource mouse_event);