Remove windows/mac/ios specific code from //ui

ui/events/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/ui.gni")
 import("//testing/test.gni")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
@@ skipping 19 matching lines @@
     "gesture_event_details.cc",
     "gesture_event_details.h",
     "gestures/fling_curve.cc",
     "gestures/fling_curve.h",
     "gestures/gesture_configuration.cc",
     "gestures/gesture_configuration.h",
     "keycodes/keyboard_code_conversion.cc",
     "keycodes/keyboard_code_conversion.h",
     "keycodes/keyboard_code_conversion_android.cc",
     "keycodes/keyboard_code_conversion_android.h",
-    "keycodes/keyboard_code_conversion_mac.h",
-    "keycodes/keyboard_code_conversion_mac.mm",
     "keycodes/keyboard_codes.h",
     "latency_info.cc",
     "latency_info.h",
     "touchscreen_device.cc",
     "touchscreen_device.h",
   ]
 
   defines = [ "EVENTS_BASE_IMPLEMENTATION" ]
 
   deps = [
@@ skipping 28 matching lines @@
     "event_targeter.cc",
     "event_targeter.h",
     "event_utils.cc",
     "event_utils.h",
     "events_export.h",
     "gestures/gesture_provider_impl.cc",
     "gestures/gesture_provider_impl.h",
     "gestures/gesture_recognizer.h",
     "gestures/gesture_recognizer_impl.cc",
     "gestures/gesture_recognizer_impl.h",
-    "gestures/gesture_recognizer_impl_mac.cc",
     "gestures/gesture_types.h",
     "gestures/motion_event_impl.cc",
     "gestures/motion_event_impl.h",
   ]
 
   defines = [ "EVENTS_IMPLEMENTATION" ]
 
   public_deps = [
     ":events_base",
   ]
   deps = [
     ":dom4_keycode_converter",
     ":gesture_detection",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
 component("gesture_detection") {
   sources = [
     "gesture_detection/bitset_32.h",
     "gesture_detection/filtered_gesture_provider.cc",
     "gesture_detection/filtered_gesture_provider.h",
     "gesture_detection/gesture_config_helper.h",
+    "gesture_detection/gesture_config_helper_aura.cc",
     "gesture_detection/gesture_detection_export.h",
     "gesture_detection/gesture_detector.cc",
     "gesture_detection/gesture_detector.h",
     "gesture_detection/gesture_event_data.cc",
     "gesture_detection/gesture_event_data.h",
     "gesture_detection/gesture_event_data_packet.cc",
     "gesture_detection/gesture_event_data_packet.h",
     "gesture_detection/gesture_listeners.cc",
     "gesture_detection/gesture_listeners.h",
     "gesture_detection/gesture_provider.cc",
     "gesture_detection/gesture_provider.h",
     "gesture_detection/gesture_touch_uma_histogram.cc",
     "gesture_detection/gesture_touch_uma_histogram.h",
     "gesture_detection/motion_event.cc",
     "gesture_detection/motion_event.h",
     "gesture_detection/motion_event_buffer.cc",
     "gesture_detection/motion_event_buffer.h",
     "gesture_detection/motion_event_generic.cc",
     "gesture_detection/motion_event_generic.h",
     "gesture_detection/scale_gesture_detector.cc",
     "gesture_detection/scale_gesture_detector.h",
     "gesture_detection/scale_gesture_listeners.cc",
     "gesture_detection/scale_gesture_listeners.h",
     "gesture_detection/snap_scroll_controller.cc",
     "gesture_detection/snap_scroll_controller.h",
     "gesture_detection/touch_disposition_gesture_filter.cc",
     "gesture_detection/touch_disposition_gesture_filter.h",
+    "gesture_detection/velocity_tracker.cc",
+    "gesture_detection/velocity_tracker.h",
     "gesture_detection/velocity_tracker_state.cc",
     "gesture_detection/velocity_tracker_state.h",
-    "gesture_detection/velocity_tracker.cc",
-    "gesture_detection/velocity_tracker.h",
-    "gesture_detection/gesture_config_helper_aura.cc",
   ]
 
   deps = [
     ":events_base",
     "//base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   defines = [ "GESTURE_DETECTION_IMPLEMENTATION" ]
@@ skipping 46 matching lines @@
     "gesture_detection/gesture_event_data_packet_unittest.cc",
     "gesture_detection/gesture_provider_unittest.cc",
     "gesture_detection/motion_event_buffer_unittest.cc",
     "gesture_detection/motion_event_generic_unittest.cc",
     "gesture_detection/touch_disposition_gesture_filter_unittest.cc",
     "gesture_detection/velocity_tracker_unittest.cc",
     "gestures/fling_curve_unittest.cc",
     "gestures/gesture_provider_impl_unittest.cc",
     "keycodes/dom4/keycode_converter_unittest.cc",
     "latency_info_unittest.cc",
+    "platform/platform_event_builder_x_unittest.cc",
     "platform/platform_event_source_unittest.cc",
-    "platform/platform_event_builder_x_unittest.cc",
     "platform/x11/platform_event_utils_x_unittest.cc",
   ]
 
   deps = [
     ":dom4_keycode_converter",
     ":events",
     ":events_base",
     ":gesture_detection",
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//skia",
     "//testing/gtest",
     "//ui/events/platform",
     "//ui/gfx:test_support",
   ]
 
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
     deps += [ "//ui/gfx/x" ]
   } else {
     sources -= [
       "platform/platform_event_builder_x_unittest.cc",
       "platform/x11/platform_event_utils_x_unittest.cc",
     ]
   }
 }