GN: Remove duplicate entries from sources lists

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 199 matching lines @@
     "ui_base_export.h",
     "ui_base_exports.cc",
     "ui_base_paths.cc",
     "ui_base_paths.h",
     "ui_base_switches.cc",
     "ui_base_switches.h",
     "ui_base_switches_util.cc",
     "ui_base_switches_util.h",
     "ui_base_types.cc",
     "ui_base_types.h",
-    "ui_base_export.h",
     "view_prop.cc",
     "view_prop.h",
     "webui/jstemplate_builder.cc",
     "webui/jstemplate_builder.h",
     "webui/web_ui_util.cc",
     "webui/web_ui_util.h",
     "win/accessibility_ids_win.h",
     "win/accessibility_misc_utils.cc",
     "win/accessibility_misc_utils.h",
     "win/atl_module.h",
@@ skipping 348 matching lines @@
       "../android/java/src/org/chromium/ui/base/LocalizationUtils.java",
       "../android/java/src/org/chromium/ui/base/ResourceBundle.java",
       "../android/java/src/org/chromium/ui/base/SelectFileDialog.java",
       "../android/java/src/org/chromium/ui/base/TouchDevice.java",
       "../android/java/src/org/chromium/ui/base/ViewAndroid.java",
       "../android/java/src/org/chromium/ui/base/WindowAndroid.java",
     ]
     jni_package = "base"
   }
 }