media: Send chrome-cache: frfr on first request.

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 6e464cbad1388c944ab1591176f9d8f2492451b0..7a5f5dcc40fba7fac27a9805e25324372f900f4d 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
@@ -292,6 +292,8 @@ void DataReductionProxyNetworkDelegate::OnBeforeSendHeadersInternal(
     data = DataReductionProxyData::GetDataAndCreateIfNecessary(request);
     if (data)
       data->set_used_data_reduction_proxy(true);
+
+    headers->RemoveHeader(chrome_proxy_header());
     VerifyHttpRequestHeaders(false, *headers);
     return;
   }
@@ -319,6 +321,7 @@ void DataReductionProxyNetworkDelegate::OnBeforeSendHeadersInternal(
       lofi_decider->RemoveAcceptTransformHeader(headers);
     }
     RemoveChromeProxyECTHeader(headers);
+    headers->RemoveHeader(chrome_proxy_header());
     VerifyHttpRequestHeaders(false, *headers);
     return;
   }