Convert Gamepad IPC messages into mojo interface.

content/common/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//ppapi/features/features.gni")
 import("//sandbox/features.gni")
@@ skipping 108 matching lines @@
     "font_list_fontconfig.cc",
     "font_list_mac.mm",
     "font_list_win.cc",
     "frame_message_enums.h",
     "frame_messages.h",
     "frame_owner_properties.cc",
     "frame_owner_properties.h",
     "frame_replication_state.cc",
     "frame_replication_state.h",
     "gamepad_hardware_buffer.h",
-    "gamepad_messages.h",
-    "gamepad_param_traits.cc",
-    "gamepad_param_traits.h",
     "generic_shared_memory_id_generator.cc",
     "generic_shared_memory_id_generator.h",
     "gin_java_bridge_messages.h",
     "gpu/client/command_buffer_metrics.cc",
     "gpu/client/command_buffer_metrics.h",
     "gpu/client/context_provider_command_buffer.cc",
     "gpu/client/context_provider_command_buffer.h",
     "gpu_host_messages.h",
     "host_shared_bitmap_manager.cc",
     "host_shared_bitmap_manager.h",
@@ skipping 471 matching lines @@
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }