Ignore MISSING_VIA_HEADER_OTHER bypasses if in relevant finch trial

components/data_reduction_proxy/browser/data_reduction_proxy_params.h

 // Copyright 2014 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_BROWSER_DATA_REDUCTION_PROXY_PARAMS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_PARAMS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 65 matching lines @@
   // proxy if the request resource type is on the critical path (e.g. HTML).
   static bool IsIncludedInCriticalPathBypassFieldTrial();
 
   // Returns true if this client is part of a field trial that runs a holdback
   // experiment. A holdback experiment is one in which a fraction of browser
   // instances will not be configured to use the data reduction proxy even if
   // users have enabled it to be used. The UI will not indicate that a holdback
   // is in effect.
   static bool IsIncludedInHoldbackFieldTrial();
 
+  // Returns true if this client is part of a field trial that removes the
+  // |MISSING_VIA_HEADER_OTHER| proxy bypass case. This experiment changes proxy
+  // bypass logic to not trigger a proxy bypass when a response with a non-4xx
+  // response code is expected to have a data reduction proxy via header, but
+  // the data reduction proxy via header is missing.
+  static bool IsIncludedInRemoveMissingViaHeaderOtherBypassFieldTrial();
+
   // Constructs configuration parameters. If |kAllowed|, then the standard
   // data reduction proxy configuration is allowed to be used. If
   // |kfallbackAllowed| a fallback proxy can be used if the primary proxy is
   // bypassed or disabled. If |kAlternativeAllowed| then an alternative proxy
   // configuration is allowed to be used. This alternative configuration would
   // replace the primary and fallback proxy configurations if enabled. Finally
   // if |kPromoAllowed|, the client may show a promotion for the data reduction
   // proxy.
   //
   // A standard configuration has a primary proxy, and a fallback proxy for
@@ skipping 188 matching lines @@
   bool fallback_allowed_;
   bool alt_allowed_;
   bool promo_allowed_;
   bool holdback_;
 
   bool configured_on_command_line_;
 };
 
 }  // namespace data_reduction_proxy
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_PARAMS_H_