Move the TouchEventQueue to be completely virtual.

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 69a67af276c8330753d9cdfd9c9a25817e8b111a..665a572e1e9a182ddc03ebba87112d02b582ccf7 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -1035,6 +1035,8 @@ source_set("browser") {
     "renderer_host/input/input_router_config_helper.h",
     "renderer_host/input/input_router_impl.cc",
     "renderer_host/input/input_router_impl.h",
+    "renderer_host/input/legacy_touch_event_queue.cc",
+    "renderer_host/input/legacy_touch_event_queue.h",
     "renderer_host/input/motion_event_web.cc",
     "renderer_host/input/motion_event_web.h",
     "renderer_host/input/mouse_wheel_event_queue.cc",
@@ -1090,7 +1092,6 @@ source_set("browser") {
     "renderer_host/input/touch_emulator.cc",
     "renderer_host/input/touch_emulator.h",
     "renderer_host/input/touch_emulator_client.h",
-    "renderer_host/input/touch_event_queue.cc",
     "renderer_host/input/touch_event_queue.h",
     "renderer_host/input/touch_selection_controller_client_aura.cc",
     "renderer_host/input/touch_selection_controller_client_aura.h",