Fetch extension blacklist states from SafeBrowsing server

chrome/browser/extensions/blacklist_state.h

+// Copyright 2013 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 CHROME_BROWSER_EXTENSIONS_BLACKLIST_STATE_H_
+#define CHROME_BROWSER_EXTENSIONS_BLACKLIST_STATE_H_
+
+namespace extensions {
+
+// The numeric values here match the values of the respective enum in
+// ClientCRXListInfoResponse proto.
+enum BlacklistState {
+  NOT_BLACKLISTED = 0,
+  BLACKLISTED_MALWARE = 1,
+  BLACKLISTED_SECURITY_VULNERABILITY = 2,
+  BLACKLISTED_CWS_POLICY_VIOLATION = 3,
+  BLACKLISTED_POTENTIALLY_UNWANTED = 4,
+  BLACKLISTED_UNKNOWN  // Used when we couldn't connect to server,
+                       // e.g. when offline.
+};
+
+} // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_BLACKLIST_STATE_H_