Fix most of the "gn check" errors in ui/*

ui/base/ime/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")
 
 source_set("ime") {
   # GYP version: ui/base/ime/ime.gypi, which is included into ui_base
   sources = [
+    "../ui_base_export.h",

[tfarina, 2014/08/28 17:54:03]

:(

     "candidate_window.cc",
     "candidate_window.h",
     "chromeos/character_composer.cc",
     "chromeos/character_composer.h",
     "chromeos/ime_bridge.cc",
     "chromeos/ime_bridge.h",
     "chromeos/ime_keymap.cc",
     "chromeos/ime_keymap.h",
     "chromeos/mock_ime_candidate_window_handler.cc",
     "chromeos/mock_ime_candidate_window_handler.h",
@@ skipping 84 matching lines @@
     sources -= [
       "composition_text_util_pango.cc",
       "composition_text_util_pango.h",
     ]
   }
 
   if (is_android) {
     deps -= [ "//ui/events" ]
   }
 }