Allow sample rate pass through on Linux.

content/renderer/media/audio_renderer_mixer_manager.cc

Index: content/renderer/media/audio_renderer_mixer_manager.cc
diff --git a/content/renderer/media/audio_renderer_mixer_manager.cc b/content/renderer/media/audio_renderer_mixer_manager.cc
index 7db67d19f86729d2b2e90263d1a07de0d1ba85c6..0044d25110f4d05435e64a8b5a1c3901a307e48e 100644
--- a/content/renderer/media/audio_renderer_mixer_manager.cc
+++ b/content/renderer/media/audio_renderer_mixer_manager.cc
@@ -52,9 +52,9 @@ media::AudioRendererMixer* AudioRendererMixerManager::GetMixer(
     return it->second.mixer;
   }
 
-  // On ChromeOS we can rely on the playback device to handle resampling, so
-  // don't waste cycles on it here.
-#if defined(OS_CHROMEOS)
+  // On ChromeOS and Linux we can rely on the playback device to handle
+  // resampling, so don't waste cycles on it here.
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
   int sample_rate = params.sample_rate();
 #else
   int sample_rate = hardware_config_->GetOutputSampleRate();