Add comment to PPB_MouseInputEvent version 1.1 that GetMovement hasn't been supported.

ppapi/cpp/input_event.cc

Index: ppapi/cpp/input_event.cc
diff --git a/ppapi/cpp/input_event.cc b/ppapi/cpp/input_event.cc
index 632b1eccd93652f9f15e227e28bb9fdbf342756c..f843615043e5d3b55d80c1a96660309125d9170e 100644
--- a/ppapi/cpp/input_event.cc
+++ b/ppapi/cpp/input_event.cc
@@ -90,14 +90,29 @@ MouseInputEvent::MouseInputEvent(Instance* instance,
                                  uint32_t modifiers,
                                  PP_InputEvent_MouseButton mouse_button,
                                  const Point& mouse_position,
+                                 int32_t click_count) {
+  // Type check the input event before setting it.
+  if (!has_interface<PPB_MouseInputEvent>())
+    return;
+  PassRefFromConstructor(get_interface<PPB_MouseInputEvent>()->Create(
+      instance->pp_instance(), type, time_stamp, modifiers, mouse_button,
+      &mouse_position.pp_point(), click_count));
+}
+
+MouseInputEvent::MouseInputEvent(Instance* instance,
+                                 PP_InputEvent_Type type,
+                                 PP_TimeTicks time_stamp,
+                                 uint32_t modifiers,
+                                 PP_InputEvent_MouseButton mouse_button,
+                                 const Point& mouse_position,
                                  int32_t click_count,
-                                 const Point& mouse_movement) {
+                                 const Point& /*mouse_movement*/) {
   // Type check the input event before setting it.
   if (!has_interface<PPB_MouseInputEvent>())
     return;
   PassRefFromConstructor(get_interface<PPB_MouseInputEvent>()->Create(
       instance->pp_instance(), type, time_stamp, modifiers, mouse_button,
-      &mouse_position.pp_point(), click_count, &mouse_movement.pp_point()));
+      &mouse_position.pp_point(), click_count));
 }
 
 PP_InputEvent_MouseButton MouseInputEvent::GetButton() const {
@@ -118,12 +133,6 @@ int32_t MouseInputEvent::GetClickCount() const {
   return get_interface<PPB_MouseInputEvent>()->GetClickCount(pp_resource());
 }
 
-Point MouseInputEvent::GetMovement() const {
-  if (!has_interface<PPB_MouseInputEvent>())
-    return Point();
-  return get_interface<PPB_MouseInputEvent>()->GetMovement(pp_resource());
-}
-
 // WheelInputEvent -------------------------------------------------------------
 
 WheelInputEvent::WheelInputEvent() : InputEvent() {