Revert of Add web compat workarounds for ES2015 RegExp semantics

src/runtime/runtime-internal.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/ast/prettyprinter.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 442 matching lines @@
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   Handle<FixedArray> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
       Object::CreateListFromArrayLike(isolate, object, ElementTypes::kAll));
   return *result;
 }
 
-
-RUNTIME_FUNCTION(Runtime_IncrementUseCounter) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_SMI_ARG_CHECKED(counter, 0);
-  isolate->CountUsage(static_cast<v8::Isolate::UseCounterFeature>(counter));
-  return isolate->heap()->undefined_value();
-}
-
 }  // namespace internal
 }  // namespace v8