[cleanup] Remove unused CodeFactory::StringFromCharCode

Bug: v8:6474
Change-Id: Ia20250d74c94bf2568ad044795188db583b7f36c
Reviewed-on: https://chromium-review.googlesource.com/539555Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46002}

src/code-factory.cc

@@ -201,12 +201,6 @@ Callable CodeFactory::NumberToString(Isolate* isolate) {
   return make_callable(stub);
 }
 
-// static
-Callable CodeFactory::StringFromCharCode(Isolate* isolate) {
-  Handle<Code> code(isolate->builtins()->StringFromCharCode());
-  return Callable(code, BuiltinDescriptor(isolate));
-}
-
 // static
 Callable CodeFactory::StringAdd(Isolate* isolate, StringAddFlags flags,
                                 PretenureFlag pretenure_flag) {

src/code-factory.h

@@ -61,8 +61,6 @@ class V8_EXPORT_PRIVATE CodeFactory final {
 
   // Code stubs. Add methods here as needed to reduce dependency on
   // code-stubs.h.
-  static Callable StringFromCharCode(Isolate* isolate);
-
   static Callable GetProperty(Isolate* isolate);
 
   static Callable NonPrimitiveToPrimitive(