Enforce RAW compression for PVer4 hash prefixes

components/safe_browsing_db/v4_update_protocol_manager.cc

 // Copyright 2016 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.
 
 #include "components/safe_browsing_db/v4_update_protocol_manager.h"
 
 #include <utility>
 
 #include "base/base64url.h"
 #include "base/macros.h"
@@ skipping 192 matching lines @@
     const auto& state = entry.second;
     ListUpdateRequest* list_update_request = request.add_list_update_requests();
     list_update_request->set_platform_type(list_to_update.platform_type);
     list_update_request->set_threat_entry_type(
         list_to_update.threat_entry_type);
     list_update_request->set_threat_type(list_to_update.threat_type);
 
     if (!state.empty()) {
       list_update_request->set_state(state);
     }
+
+    // TODO(vakh): Accept other compression formats also.
+    // See: https://bugs.chromium.org/p/chromium/issues/detail?id=624567
+    list_update_request->mutable_constraints()->add_supported_compressions(RAW);
   }
 
   // Serialize and Base64 encode.
   std::string req_data, req_base64;
   request.SerializeToString(&req_data);
   base::Base64UrlEncode(req_data, base::Base64UrlEncodePolicy::INCLUDE_PADDING,
                         &req_base64);
   return req_base64;
 }
 
@@ skipping 119 matching lines @@
 
 void V4UpdateProtocolManager::GetUpdateUrlAndHeaders(
     const std::string& req_base64,
     GURL* gurl,
     net::HttpRequestHeaders* headers) const {
   V4ProtocolManagerUtil::GetRequestUrlAndHeaders(
       req_base64, "threatListUpdates:fetch", config_, gurl, headers);
 }
 
 }  // namespace safe_browsing