Retry reinstallation of corrupted policy extensions.

extensions/browser/content_verifier_delegate.h

Index: extensions/browser/content_verifier_delegate.h
diff --git a/extensions/browser/content_verifier_delegate.h b/extensions/browser/content_verifier_delegate.h
index 0eea3a237053c69eca59b499f47a656487ac647e..e719e002a735977db10f0c84f2c26b442c69022a 100644
--- a/extensions/browser/content_verifier_delegate.h
+++ b/extensions/browser/content_verifier_delegate.h
@@ -77,6 +77,9 @@ class ContentVerifierDelegate {
   // an extension did not match its expected hash.
   virtual void VerifyFailed(const std::string& extension_id,
                             ContentVerifyJob::FailureReason reason) = 0;
+
+  // Called when ExtensionSystem is shutting down.
+  virtual void Shutdown() = 0;
 };
 
 }  // namespace extensions