[runtime] Make Runtime::GetCallerArguments local to scopes.

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 1fa7e2c657a169e2a846753c1d215e74bbec1e32..00893e76023bab5fe89b510730214d19dc2e7d67 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -1182,15 +1182,6 @@ class Runtime : public AllStatic {
 
   static MaybeHandle<JSArray> GetInternalProperties(Isolate* isolate,
                                                     Handle<Object>);
-
-  // Find the arguments of the JavaScript function invocation that called
-  // into C++ code. Collect these in a newly allocated array of handles
-  // (possibly prefixed by a number of empty handles).
-  // TODO(mstarzinger): Temporary workaround until this is only used by the
-  // %_Arguments and %_ArgumentsLength intrinsics. Make this function local to
-  // runtime-scopes.cc then.
-  static base::SmartArrayPointer<Handle<Object>> GetCallerArguments(
-      Isolate* isolate, int prefix_argc, int* total_argc);
 };