Error pages: Break retain cycle NativeContent/StaticHTMLViewController

ios/chrome/browser/web/error_page_generator.h

Index: ios/chrome/browser/web/error_page_generator.h
diff --git a/ios/chrome/browser/web/error_page_generator.h b/ios/chrome/browser/web/error_page_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..b644e1ee222175a72c84d53400386e5c084b9479
--- /dev/null
+++ b/ios/chrome/browser/web/error_page_generator.h
@@ -0,0 +1,22 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_BROWSER_WEB_ERROR_PAGE_GENERATOR_H_
+#define IOS_CHROME_BROWSER_WEB_ERROR_PAGE_GENERATOR_H_
+
+#import <Foundation/Foundation.h>
+
+#import "ios/chrome/browser/ui/static_content/static_html_view_controller.h"
+
+// This class is needed because StaticHtmlViewController retains the
+// HtmlGenerator.
+@interface ErrorPageGenerator : NSObject<HtmlGenerator>
+- (instancetype)initWithError:(NSError*)error
+                       isPost:(BOOL)isPost
+                  isIncognito:(BOOL)isIncognito NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+@end
+
+#endif  // IOS_CHROME_BROWSER_WEB_ERROR_PAGE_GENERATOR_H_