DataReductionProxy proto change to use exp=force_lite_page directive

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 3a8d596b6716b11cca6278cdafec19924c44e421..8961f1b7afb3816de9002dfb457070fa533623f4 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
@@ -46,7 +46,7 @@ const char kIdentityDirective[] = "identity";
 // The legacy Chrome-Proxy response header directive for LoFi images.
 const char kLegacyChromeProxyLoFiResponseDirective[] = "q=low";
 
-const char kChromeProxyLitePageIngoreBlacklist[] = "ignore_preview_blacklist";
+const char kChromeProxyForceLitePageExperiment[] = "force_lite_page";
 
 const char kIfHeavyQualifier[] = "if-heavy";
 
@@ -154,8 +154,8 @@ const char* identity_directive() {
   return kIdentityDirective;
 }
 
-const char* chrome_proxy_lite_page_ignore_blacklist() {
-  return kChromeProxyLitePageIngoreBlacklist;
+const char* chrome_proxy_force_lite_page_experiment() {
+  return kChromeProxyForceLitePageExperiment;
 }
 
 const char* if_heavy_qualifier() {