blink_gc_plugin: always enable warn_stack_allocated_trace_method check.

tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp

Index: tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
diff --git a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
index 099b2bd96bdd4f2ad0fbaa71b28bd2fd26ea046f..43b064ccdcf3f2068f7633de2aa1c51212cb0af8 100644
--- a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
+++ b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
@@ -34,7 +34,9 @@ class BlinkGCPluginAction : public PluginASTAction {
       if (arg == "dump-graph") {
         options_.dump_graph = true;
       } else if (arg == "warn-stack-allocated-trace-method") {
-        options_.warn_stack_allocated_trace_method = true;
+        // TODO(sof): after next roll, remove this option to round out
+        // crbug.com/689874
+        continue;
       } else if (arg == "warn-unneeded-finalizer") {
         options_.warn_unneeded_finalizer = true;
       } else if (arg == "use-chromium-style-naming") {