Delete the utility process startup ping.

chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_SANDBOXED_DMG_ANALYZER_MAC_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SANDBOXED_DMG_ANALYZER_MAC_H_
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 30 matching lines @@
   void OpenDMGFile();
 
   // Called on the IO thread, this starts the utility process.
   void StartAnalysis();
 
   // content::UtilityProcessHostClient:
   void OnProcessCrashed(int exit_code) override;
   void OnProcessLaunchFailed() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  // Message handler for reply ping when the utility process has started.
-  void OnUtilityProcessStarted();
-
   // Message handler to receive the results of the analysis. Invokes the
   // |callback_|.
   void OnAnalysisFinished(const zip_analyzer::Results& results);
 
   const base::FilePath file_path_;  // The path of the DMG file.
   base::File file_;  // The opened file handle for |file_path_|.
 
-  // Weak reference to the utility process, which owns this.
-  base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
-
   const ResultsCallback callback_;  // Result callback.
   bool callback_called_;  // Whether |callback_| has already been invoked.
 
   DISALLOW_COPY_AND_ASSIGN(SandboxedDMGAnalyzer);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SANDBOXED_DMG_ANALYZER_MAC_H_