New post-sideload UI:

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 0850b36a50d1802e22abf53f5353f65b4f1234d4..95ad89198ff6bea1a6e3762b67527072bdc2310a 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -173,6 +173,10 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
   // Based on extension id, checks prefs to see if it is orphaned.
   bool IsExtensionOrphaned(const std::string& id);
 
+  // Increment the count of how many times we prompted the user to acknowledge
+  // the given extension, and return the new count.
+  int IncrementAcknowledgePromptCount(const std::string& extension_id);
+
   // Whether the user has acknowledged an external extension.
   bool IsExternalExtensionAcknowledged(const std::string& extension_id);
   void AcknowledgeExternalExtension(const std::string& extension_id);