fix libgio-2.0 deps in browser_ui

browser_desktop_root_window_host_x11.cc uses g_dbus_proxy_call which
is provided by libgio-2.0, so we should depend on the gio target too.

BUG=265560

Review URL: https://codereview.chromium.org/439613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287981 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_browser_ui.gypi

@@ -2912,6 +2912,7 @@
               'sources': [ '<@(chrome_browser_ui_x11_sources)' ],
               'dependencies': [
                 '../build/linux/system.gyp:x11',
+                '../build/linux/system.gyp:gio',
               ],
             }],
           ],