Ignore MISSING_VIA_HEADER_OTHER bypasses if in relevant finch trial

components/data_reduction_proxy/browser/data_reduction_proxy_params.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_params.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
index f9ec3a308c7e1da00ae33ad9a3cd18d1bedf2d47..a4fce08a9eb5c22c76fb223d0f6113f80cd57cc3 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
@@ -83,6 +83,13 @@ class DataReductionProxyParams {
   // 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