Fix more symbol exports and a compile failure for the component build of

media/audio/audio_input_controller.h

Index: media/audio/audio_input_controller.h
diff --git a/media/audio/audio_input_controller.h b/media/audio/audio_input_controller.h
index 22f6ffe5da20125423d376633dbb8cd80731066c..dd2900189f812d12e5e7b2255799a4fa06ad056b 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -41,7 +41,7 @@ class MEDIA_EXPORT AudioInputController
  public:
   // An event handler that receives events from the AudioInputController. The
   // following methods are called on the audio input controller thread.
-  class EventHandler {
+  class MEDIA_EXPORT EventHandler {
    public:
     virtual ~EventHandler() {}
     virtual void OnCreated(AudioInputController* controller) = 0;