Remove the EventFactory machinery.

sky/engine/core/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//sky/engine/bindings/scripts/scripts.gni")
 import("//sky/engine/build/scripts/scripts.gni")
 import("//sky/engine/core/core.gni")
 
 visibility = [ "//sky/engine/*" ]
 
@@ skipping 309 matching lines @@
 
 process_in_files("make_core_generated_event_factory") {
   script = "../build/scripts/make_event_factory.py"
 
   in_files = [
     "$sky_core_output_dir/EventInterfaces.in",
     "events/EventAliases.in",
   ]
   other_inputs = make_event_factory_files
   outputs = [
-    "$sky_core_output_dir/Event.cpp",
     "$sky_core_output_dir/EventHeaders.h",
     "$sky_core_output_dir/EventInterfaces.h",
   ]
   deps = [
     ":core_names",
     ":libraries",
   ]
 }
 
 process_in_files("make_core_generated_media_feature_names") {
@@ skipping 117 matching lines @@
     "$sky_core_output_dir/{{source_name_part}}.h",
   ]
   args = [
     "{{source}}",
     rel_sky_core_gen_dir,
     bison_exe,
   ]
 
   deps = make_core_generated_deps
 }