Revert "Add Accept-Encoding: br for secure Data Reduction Proxy requests."

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
index 85b7dd364cbe3ca6df891945d585e33214b3eaeb..8ecf20e4141a15c840026df345c472c76ff607d5 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
@@ -291,12 +291,6 @@ void DataReductionProxyNetworkDelegate::OnBeforeSendHeadersInternal(
 
   if (data_reduction_proxy_request_options_) {
     data_reduction_proxy_request_options_->AddRequestHeader(headers);
-    // Data Reduction Proxy handles Accept-Encoding: Brotli correctly, but don't
-    // trust intermediate proxies.
-    if (proxy_info.is_https() || proxy_info.is_quic()) {
-      data_reduction_proxy_request_options_->AddBrotliAcceptEncoding(*request,
-                                                                     headers);
-    }
   }
 }