Exempt default apps from external-extension alerts.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 006d6551efc5250066578e51f9ded3f8903e344f..370ad2208beaec2c75f7ba49de07c8e9299c033d 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -505,7 +505,8 @@ class ExtensionService
                                             const Version* version,
                                             const FilePath& path,
                                             Extension::Location location,
-                                            int creation_flags)
+                                            int creation_flags,
+                                            bool mark_acknowledged)
       OVERRIDE;
 
   virtual void OnExternalExtensionUpdateUrlFound(const std::string& id,
@@ -527,6 +528,10 @@ class ExtensionService
   void HandleExtensionAlertAccept(const ExtensionGlobalError& global_error,
                                   Browser* browser);
 
+  // Given a (presumably just-installed) extension id, mark that extension as
+  // acknowledged.
+  void AcknowledgeExternalExtension(const std::string& id);
+
   // Opens the Extensions page because the user wants to get more details
   // about the alerts.
   void HandleExtensionAlertDetails(const ExtensionGlobalError& global_error,