tools/gn: Remove fallback to direct_dependent_configs.

tools/gn/target_generator.cc

Index: tools/gn/target_generator.cc
diff --git a/tools/gn/target_generator.cc b/tools/gn/target_generator.cc
index cd633f200018d9d5bda1ed6813a7a78d88c0e47a..833b382e274147275463fa4b3cbc2577359c6ec8 100644
--- a/tools/gn/target_generator.cc
+++ b/tools/gn/target_generator.cc
@@ -183,17 +183,11 @@ bool TargetGenerator::FillDependentConfigs() {
   if (!FillGenericConfigs(variables::kAllDependentConfigs,
                           &target_->all_dependent_configs()))
     return false;
+
   if (!FillGenericConfigs(variables::kPublicConfigs,
                           &target_->public_configs()))
     return false;
 
-  // "public_configs" was previously named "direct_dependent_configs", fall
-  // back to that if public_configs was undefined.
-  if (!scope_->GetValue(variables::kPublicConfigs, false)) {
-    if (!FillGenericConfigs("direct_dependent_configs",
-                            &target_->public_configs()))
-      return false;
-  }
   return true;
 }