[es6] Remove left-overs from Function.prototype.toMethod.

src/objects.cc

 // Copyright 2013 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 10116 matching lines @@
     PrintF("  ** Marking ");
     ShortPrint();
     PrintF(" for concurrent recompilation.\n");
   }
   set_code_no_write_barrier(
       isolate->builtins()->builtin(Builtins::kCompileOptimizedConcurrent));
   // No write barrier required, since the builtin is part of the root set.
 }
 
 
-Handle<JSFunction> JSFunction::CloneClosure(Handle<JSFunction> function) {
-  Isolate* isolate = function->GetIsolate();
-  Handle<Map> map(function->map());
-  Handle<SharedFunctionInfo> shared(function->shared());
-  Handle<Context> context(function->context());
-  Handle<JSFunction> clone =
-      isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context);
-
-  if (shared->bound()) {
-    clone->set_function_bindings(function->function_bindings());
-  }
-
-  // In typical case, __proto__ of ``function`` is the default Function
-  // prototype, which means that SetPrototype below is a no-op.
-  // In rare cases when that is not true, we mutate the clone's __proto__.
-  Handle<Object> original_prototype(map->prototype(), isolate);
-  if (*original_prototype != clone->map()->prototype()) {
-    JSObject::SetPrototype(clone, original_prototype, false).Assert();
-  }
-
-  return clone;
-}
-
-
 void SharedFunctionInfo::AddSharedCodeToOptimizedCodeMap(
     Handle<SharedFunctionInfo> shared, Handle<Code> code) {
   Isolate* isolate = shared->GetIsolate();
   DCHECK(code->kind() == Code::OPTIMIZED_FUNCTION);
   Handle<Object> value(shared->optimized_code_map(), isolate);
   if (value->IsSmi()) return;  // Empty code maps are unsupported.
   Handle<FixedArray> code_map = Handle<FixedArray>::cast(value);
   code_map->set(kSharedCodeIndex, *code);
 }
 
@@ skipping 6598 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8