Revert "Revert 3 mac autofill CLs."

components/autofill/core/browser/autofill_external_delegate.h

Index: components/autofill/core/browser/autofill_external_delegate.h
diff --git a/components/autofill/core/browser/autofill_external_delegate.h b/components/autofill/core/browser/autofill_external_delegate.h
index 672b2d63d18955557b72fa32fb7a86cbb7f57b67..b1e41110b95005bbc591906b6a08334ac6775ea7 100644
--- a/components/autofill/core/browser/autofill_external_delegate.h
+++ b/components/autofill/core/browser/autofill_external_delegate.h
@@ -80,6 +80,9 @@ class AutofillExternalDelegate
   // values or settings.
   void Reset();
 
+  // The renderer sent an IPC acknowledging an earlier ping IPC.
+  void OnPingAck();
+
  protected:
   base::WeakPtr<AutofillExternalDelegate> GetWeakPtr();
 
@@ -111,6 +114,11 @@ class AutofillExternalDelegate
                             std::vector<base::string16>* icons,
                             std::vector<int>* unique_ids);
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  // Pings the renderer.
+  void PingRenderer();
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
   AutofillManager* manager_;  // weak.
 
   // Provides driver-level context to the shared code of the component. Must