Removed requirement that data reduction proxy key be non-empty

components/data_reduction_proxy/browser/data_reduction_proxy_params.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_params.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_params.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_params.cc
index 16e0d20c6033e603005177f549a7b3a2c58a1cc4..812f10a52cb203ea31219b7b1f1cdafee101520f 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_params.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_params.cc
@@ -137,13 +137,6 @@ bool DataReductionProxyParams::Init(
     return false;
   }
 
-  if (allowed || alt_allowed) {
-    if (key_.empty()) {
-      DVLOG(1) << "Invalid key: <empty>";
-      return false;
-    }
-  }
-
   if (fallback_allowed_ && !allowed_) {
     DVLOG(1) << "The data reduction proxy fallback cannot be allowed if "
         << "the data reduction proxy is not allowed";