Delete the utility process startup ping.

chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h

Index: chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h
diff --git a/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h b/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h
index 307776a36181eca5b8a35be47dc09cc4645c0419..19e5a2f3d69c5d5a012610e795994f3eab4638ce 100644
--- a/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h
+++ b/chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.h
@@ -48,9 +48,6 @@ class SandboxedDMGAnalyzer : public content::UtilityProcessHostClient {
   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);
@@ -58,9 +55,6 @@ class SandboxedDMGAnalyzer : public content::UtilityProcessHostClient {
   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.