untangle pango usage from use_x11 and OS==linux

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     'browser/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
@@ skipping 1191 matching lines @@
         '../build/linux/system.gyp:dbus',
         '../build/linux/system.gyp:fontconfig',
         '../dbus/dbus.gyp:dbus',
       ],
     }],
     ['use_x11==1', {
       'dependencies': [
         '../build/linux/system.gyp:x11',
       ],
     }],
-    ['OS=="linux"', {
+    ['use_pango==1', {
       'dependencies': [
         '../build/linux/system.gyp:pangocairo',
       ],
     }],
     ['OS=="android"', {
       'dependencies': [
         '../media/media.gyp:media',
         'content.gyp:content_jni_headers',
       ],
       'link_settings': {
@@ skipping 142 matching lines @@
         '../third_party/speex/speex.gyp:libspeex',
       ],
     }],
     ['linux_use_libgps==1', {
       'dependencies': [
         '../build/linux/system.gyp:libgps',
       ],
     }],
   ],
 }