Fixing small internal naming error.

src/core/ext/filters/client_channel/lb_policy/xds/xds_routing.cc

@@ -712,7 +712,7 @@ class XdsRoutingLbFactory : public LoadBalancingPolicyFactory {
           "value should be of type object"));
       return error_list;
     }
-    auto it = json.object_value().find("child_policy");
+    auto it = json.object_value().find("childPolicy");
     if (it == json.object_value().end()) {
       error_list.push_back(
           GRPC_ERROR_CREATE_FROM_STATIC_STRING("did not find childPolicy"));

src/core/ext/filters/client_channel/xds/xds_client.cc

@@ -2043,7 +2043,7 @@ namespace {
 std::string CreateServiceConfigActionCluster(const std::string& cluster_name) {
   return absl::StrFormat(
       "      \"cds:%s\":{\n"
-      "        \"child_policy\":[ {\n"
+      "        \"childPolicy\":[ {\n"
       "          \"cds_experimental\":{\n"
       "            \"cluster\": \"%s\"\n"
       "          }\n"
@@ -2073,7 +2073,7 @@ std::string CreateServiceConfigActionWeightedCluster(
   std::vector<std::string> config_parts;
   config_parts.push_back(
       absl::StrFormat("      \"weighted:%s\":{\n"
-                      "        \"child_policy\":[ {\n"
+                      "        \"childPolicy\":[ {\n"
                       "          \"weighted_target_experimental\":{\n"
                       "            \"targets\":{\n",
                       name));