Remove unnecessary dependencies on mojo/edk/system

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")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 383 matching lines @@
       "blink/blink_event_util_unittest.cc",
       "blink/input_handler_proxy_unittest.cc",
       "blink/input_scroll_elasticity_controller_unittest.cc",
       "gestures/blink/web_gesture_curve_impl_unittest.cc",
       "ipc/latency_info_param_traits_unittest.cc",
       "mojo/struct_traits_unittest.cc",
     ]
     deps += [
       "//cc",
       "//ipc:test_support",
-      "//mojo/edk/system",
       "//mojo/public/cpp/bindings",
       "//third_party/WebKit/public:blink_headers",
       "//ui/events/blink",
       "//ui/events/gestures/blink",
       "//ui/events/ipc",
       "//ui/events/mojo:test_interfaces",
       "//ui/gfx/ipc/geometry",
     ]
   }
 
@@ skipping 63 matching lines @@
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 
   generate_jar_jni("keyevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/KeyEvent.class" ]
   }
 }