Move data reduction proxy to Chrome-Proxy header for authentication

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index aeef83e9b9c595b09a709dd521dcc9f56f11d7a0..60d20bbbe20233b56e2657e19e07e9430146c489 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -134,6 +134,8 @@ class HttpCache::Transaction : public HttpTransaction {
       net::WebSocketHandshakeStreamBase::CreateHelper* create_helper) OVERRIDE;
   virtual void SetBeforeNetworkStartCallback(
       const BeforeNetworkStartCallback& callback) OVERRIDE;
+  virtual void SetBeforeProxyHeadersSentCallback(
+      const BeforeProxyHeadersSentCallback& callback) OVERRIDE;
   virtual int ResumeNetworkStart() OVERRIDE;
 
  private:
@@ -443,6 +445,7 @@ class HttpCache::Transaction : public HttpTransaction {
       websocket_handshake_stream_base_create_helper_;
 
   BeforeNetworkStartCallback before_network_start_callback_;
+  BeforeProxyHeadersSentCallback before_proxy_headers_sent_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Transaction);
 };