Disable enumeration caching for output devices.

content/browser/renderer_host/media/audio_output_device_enumerator.h

Index: content/browser/renderer_host/media/audio_output_device_enumerator.h
diff --git a/content/browser/renderer_host/media/audio_output_device_enumerator.h b/content/browser/renderer_host/media/audio_output_device_enumerator.h
index 9ca251ed3dbaca98afa3395b91bd1f443bfc7f0e..740e9c64f1e068a2e88c3996346a179f8ea40434 100644
--- a/content/browser/renderer_host/media/audio_output_device_enumerator.h
+++ b/content/browser/renderer_host/media/audio_output_device_enumerator.h
@@ -72,6 +72,10 @@ class CONTENT_EXPORT AudioOutputDeviceEnumerator {
   // Sets the cache policy.
   void SetCachePolicy(CachePolicy cache_policy);
 
+  // Returns true if the caching policy is different from
+  // CACHE_POLICY_NO_CACHING, false otherwise.
+  bool IsCacheEnabled();
+
  private:
   void InitializeOnIOThread();
   void DoEnumerateDevices();