Delete the utility process startup ping.

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h

Index: chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h
diff --git a/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h b/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h
index 64efe48217a2e0438db6cb49fe28f1a14d7491d0..2cb9b0e7f09eed8342f5fd0cd6729dd022708daf 100644
--- a/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h
+++ b/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h
@@ -34,16 +34,12 @@ class SafeAudioVideoChecker : public content::UtilityProcessHostClient {
  private:
   enum State {
     INITIAL_STATE,
-    PINGED_STATE,
     STARTED_STATE,
     FINISHED_STATE
   };
 
   ~SafeAudioVideoChecker() override;
 
-  // Starts validation once the utility process has been started.
-  virtual void OnProcessStarted();
-
   // Notification of the result from the utility process.
   void OnCheckingFinished(bool valid);