Allow the user to "repair" a corrupted extension.

chrome/browser/ui/webui/extensions/extension_settings_handler.h

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.h
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.h b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
index 7cca3a32a5c4d2499154b1e16a68419f1735bbf5..87de3bfaae628c4ccce88033f48a6a4d881af831 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.h
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
 #include "chrome/browser/extensions/requirements_checker.h"
+#include "chrome/common/extensions/webstore_install_result.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -164,6 +165,9 @@ class ExtensionSettingsHandler
   // Callback for "reload" message.
   void HandleReloadMessage(const base::ListValue* args);
 
+  // Callback for "repair" message.
+  void HandleRepairMessage(const base::ListValue* args);
+
   // Callback for "enable" message.
   void HandleEnableMessage(const base::ListValue* args);
 
@@ -228,6 +232,11 @@ class ExtensionSettingsHandler
   // needed.
   ExtensionUninstallDialog* GetExtensionUninstallDialog();
 
+  // Called when the reinstallation is complete.
+  void OnReinstallComplete(bool success,
+                           const std::string& error,
+                           webstore_install::Result result);
+
   // Callback for RequirementsChecker.
   void OnRequirementsChecked(std::string extension_id,
                              std::vector<std::string> requirement_errors);