bootstrapper: Use heap symbol for stackTraceLimit.

This is already a heap root, so no need to internalize the string again,
nor to open a local handle for it (the one the factory gives is sufficient).

Change-Id: I5095bd378956ab6667b8a1f9d8f3e3d19ddffdb9
Reviewed-on: https://chromium-review.googlesource.com/1177889Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55216}

src/bootstrapper.cc

@@ -5262,12 +5262,10 @@ bool Bootstrapper::InstallExtensions(Handle<Context> native_context,
 
 bool Genesis::InstallSpecialObjects(Isolate* isolate,
                                     Handle<Context> native_context) {
-  Factory* factory = isolate->factory();
   HandleScope scope(isolate);
 
   Handle<JSObject> Error = isolate->error_function();
-  Handle<String> name =
-      factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("stackTraceLimit"));
+  Handle<String> name = isolate->factory()->stackTraceLimit_string();
   Handle<Smi> stack_trace_limit(Smi::FromInt(FLAG_stack_trace_limit), isolate);
   JSObject::AddProperty(isolate, Error, name, stack_trace_limit, NONE);