Remove unused parameter displayId

The parameter is not currently used in InputDispatcher.

Test: presubmit
Bug: none
Change-Id: I61f9e6566e4fe77318814e56e73b7f3470fa6a04
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index aa98ef7..7d69854 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -471,7 +471,7 @@
             FakeInputReceiver(dispatcher, name, displayId),
             mFocused(false), mFrame(Rect(0, 0, WIDTH, HEIGHT)), mLayoutParamFlags(0) {
             mServerChannel->setToken(new BBinder());
-            mDispatcher->registerInputChannel(mServerChannel, displayId);
+            mDispatcher->registerInputChannel(mServerChannel);
 
             inputApplicationHandle->updateInfo();
             mInfo.applicationInfo = *inputApplicationHandle->getInfo();