content: Remove unused speex related code.

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': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
     '../device/battery/battery.gyp:device_battery_mojo_bindings',
@@ skipping 2065 matching lines @@
         '../ppapi/ppapi_internal.gyp:ppapi_ipc',
         '../ppapi/ppapi_internal.gyp:ppapi_shared',
       ],
       'sources': [
         '<@(plugin_browser_sources)',
       ],
     }],
     ['enable_web_speech==1', {
       'dependencies': [
         '../third_party/flac/flac.gyp:libflac',
-        '../third_party/speex/speex.gyp:libspeex',
       ],
     }],
     ['enable_web_speech==0 and OS=="android"', {
       'sources/': [
         ['exclude', '^browser/speech/'],
         ['include', '^browser/speech/speech_recognition_dispatcher_host\\.(cc|h)$'],
         ['include', '^browser/speech/speech_recognition_manager_impl\\.(cc|h)$'],
         ['include', '^browser/speech/speech_recognizer\\.h$'],
         ['include', '^browser/speech/speech_recognizer_impl_android\\.(cc|h)$'],
       ],
@@ skipping 34 matching lines @@
       'sources': [
         'browser/vr/vr_device.cc',
         'browser/vr/vr_device.h',
         'browser/vr/vr_device_manager.cc',
         'browser/vr/vr_device_manager.h',
         'browser/vr/vr_device_provider.h',
       ]
     }],
   ],
 }