Update CPAT protocol to send lite-page transform acceptance with ect

components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc

Index: components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc
diff --git a/components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc b/components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc
index d8a021928967a12591b5460e750a99d0d08a8048..042c8a9a15d903c2c46af25c6665af7e7d1d43ac 100644
--- a/components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc
+++ b/components/data_reduction_proxy/core/common/data_reduction_proxy_headers.cc
@@ -46,10 +46,7 @@ const char kIdentityDirective[] = "identity";
 // The legacy Chrome-Proxy response header directive for LoFi images.
 const char kLegacyChromeProxyLoFiResponseDirective[] = "q=low";
 
-const char kChromeProxyLitePageIngoreBlacklistDirective[] =
-    "exp=ignore_preview_blacklist";
-
-const char kIfHeavyQualifier[] = "if-heavy";
+const char kChromeProxyForceLitePageDirective[] = "exp=force_lite_page";
 
 const char kChromeProxyActionBlockOnce[] = "block-once";
 const char kChromeProxyActionBlock[] = "block";
@@ -155,12 +152,8 @@ const char* identity_directive() {
   return kIdentityDirective;
 }
 
-const char* chrome_proxy_lite_page_ignore_blacklist_directive() {
-  return kChromeProxyLitePageIngoreBlacklistDirective;
-}
-
-const char* if_heavy_qualifier() {
-  return kIfHeavyQualifier;
+const char* chrome_proxy_force_lite_page_directive() {
+  return kChromeProxyForceLitePageDirective;
 }
 
 bool IsEmptyImagePreview(const net::HttpResponseHeaders& headers) {