InputTracer: Don't make WindowDispatchArgs an inner class

For consistency with other structs and definitions in the backend
interface, move WindowDispatchArgs outside of the interface class.

Bug: 210460522
Test: atest inputflinger_tests
Change-Id: I9fe98448bace259faa40b082981211fdf9b1e221
diff --git a/services/inputflinger/dispatcher/trace/AndroidInputEventProtoConverter.h b/services/inputflinger/dispatcher/trace/AndroidInputEventProtoConverter.h
index 8a46f15..ab5f9ca 100644
--- a/services/inputflinger/dispatcher/trace/AndroidInputEventProtoConverter.h
+++ b/services/inputflinger/dispatcher/trace/AndroidInputEventProtoConverter.h
@@ -32,7 +32,7 @@
     static void toProtoMotionEvent(const TracedMotionEvent& event,
                                    proto::AndroidMotionEvent& outProto);
     static void toProtoKeyEvent(const TracedKeyEvent& event, proto::AndroidKeyEvent& outProto);
-    static void toProtoWindowDispatchEvent(const InputTracingBackendInterface::WindowDispatchArgs&,
+    static void toProtoWindowDispatchEvent(const WindowDispatchArgs&,
                                            proto::AndroidWindowInputDispatchEvent& outProto);
 };