[Chromedriver] Do not need release events for wheel events

In Chromedriver's ExecutePerformActions, we put the mouse events which
have a button pressed in a list of input_cancel_list in the session, so
we will release any pressed buttons at the end of each test.

For mouse wheel events we also generate mouse events with type of
"wheel", and it does not support any pressed button, so we should not
push the mouse event in the input_cancel_list.

Bug: 1040611
Change-Id: I3f651a26b9137dbd8e7754d62852be64f44d5e6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387546Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803673}

chrome/test/chromedriver/window_commands.cc

@@ -1662,8 +1662,6 @@ Status ExecutePerformActions(Session* session,
                 event.delta_y = delta_y;
                 buttons[id] |= StringToModifierMouseButton(button_type[id]);
                 session->mouse_position = WebPoint(event.x, event.y);
-                session->input_cancel_list.emplace_back(
-                    action_input_states[j], &event, nullptr, nullptr);
                 dispatch_wheel_events.push_back(event);
                 Status status = web_view->DispatchMouseEvents(
                     dispatch_wheel_events, session->GetCurrentFrameId(),