Reland r20652 "Handlify and convert string.length to new API-style accessor."

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 7c54d92190be257d30093988161ab4cc18224589..71672d7e4e9c863ce3af8c2ea9337283946cb185 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -911,10 +911,10 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
         Handle<Map>(native_context()->string_function()->initial_map());
     Map::EnsureDescriptorSlack(string_map, 1);
 
-    Handle<Foreign> string_length(
-        factory->NewForeign(&Accessors::StringLength));
     PropertyAttributes attribs = static_cast<PropertyAttributes>(
         DONT_ENUM | DONT_DELETE | READ_ONLY);
+    Handle<AccessorInfo> string_length(
+        Accessors::StringLengthInfo(isolate, attribs));
 
     {  // Add length.
       CallbacksDescriptor d(factory->length_string(), string_length, attribs);