Add DOM UI version of "Customize modifier keys" dialog.

TEST=manually on the netbook
BUG=chromium-os:5152

Review URL: http://codereview.chromium.org/3153022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57141 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 1d6efa4..c49f69d 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -426,6 +426,8 @@
         'browser/chromeos/dom_ui/labs_handler.h',
         'browser/chromeos/dom_ui/language_chewing_options_handler.cc',
         'browser/chromeos/dom_ui/language_chewing_options_handler.h',
+        'browser/chromeos/dom_ui/language_customize_modifier_keys_handler.cc',
+        'browser/chromeos/dom_ui/language_customize_modifier_keys_handler.h',
         'browser/chromeos/dom_ui/language_hangul_options_handler.cc',
         'browser/chromeos/dom_ui/language_hangul_options_handler.h',
         'browser/chromeos/dom_ui/language_mozc_options_handler.cc',