Adding opt out and previews type information to DRP pingback

components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h

 // Copyright 2015 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 COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 102 matching lines @@
   // operation takes place asynchronously.
   void RetrieveConfig();
 
   // Takes a serialized Data Reduction Proxy configuration and sets it as the
   // current Data Reduction Proxy configuration. If a remote configuration has
   // already been retrieved, the remote configuration takes precedence.
   void ApplySerializedConfig(const std::string& config_value);
 
   // Examines |response_headers| to determine if an authentication failure
   // occurred on a Data Reduction Proxy. Returns true if authentication failure
-  // occured, and the session key specified in |request_headers| matches the
+  // occurred, and the session key specified in |request_headers| matches the
   // current session in use by the client. If an authentication failure is
   // detected,  it fetches a new config.
   bool ShouldRetryDueToAuthFailure(
       const net::HttpRequestHeaders& request_headers,
       const net::HttpResponseHeaders* response_headers,
       const net::ProxyServer& proxy_server,
       const net::LoadTimingInfo& load_timing_info);
 
  protected:
   // Retrieves the backoff entry object being used to throttle request failures.
@@ skipping 146 matching lines @@
   bool fetch_in_progress_;
 
   // Enforce usage on the IO thread.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyConfigServiceClient);
 };
 
 }  // namespace data_reduction_proxy
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_