GN: Add -Wl,-z defs on linux and fix errors

ui/base/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")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 292 matching lines @@
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
     "//base:base_static",
     "//base:i18n",
     "//net",
     "//third_party/icu",
+    "//ui/events",
     "//ui/events/devices",
     "//ui/resources",
     "//ui/strings",
     "//url",
   ]
 
   if (build_ime) {
-    if (!is_android) {
-      deps += [ "//ui/events" ]
-    }
-
     sources += [
       "ime/candidate_window.cc",
       "ime/candidate_window.h",
       "ime/chromeos/character_composer.cc",
       "ime/chromeos/character_composer.h",
       "ime/chromeos/component_extension_ime_manager.cc",
       "ime/chromeos/component_extension_ime_manager.h",
       "ime/chromeos/composition_text.cc",
       "ime/chromeos/composition_text.h",
       "ime/chromeos/extension_ime_util.cc",
@@ skipping 602 matching lines @@
 # TODO(GYP) Mac (ui_base_tests_bundle)
 if (is_android) {
   unittest_apk("ui_base_unittests_apk") {
     unittests_dep = ":ui_base_unittests"
     deps = [
       ":ui_base_unittests",
       "//chrome:resources",
     ]
   }
 }