Implement handlified String::Flatten.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7571 matching lines @@
     a++;
     b++;
   }
 }
 
 
 int GetUtf8Length(Handle<String> str) {
   int len = str->Utf8Length();
   if (len < 0) {
     i::Handle<i::String> istr(v8::Utils::OpenHandle(*str));
-    i::FlattenString(istr);
+    i::String::Flatten(istr);
     len = str->Utf8Length();
   }
   return len;
 }
 
 
 THREADED_TEST(StringWrite) {
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   v8::Handle<String> str = v8_str("abcde");
@@ skipping 11325 matching lines @@
   Local<Value> result = CompileRun(init_code);
 
   Local<Value> indexof = CompileRun("str2.indexOf('els')");
   Local<Value> lastindexof = CompileRun("str2.lastIndexOf('dab')");
 
   CHECK(result->IsString());
   i::Handle<i::String> string = v8::Utils::OpenHandle(String::Cast(*result));
   int length = string->length();
   CHECK(string->IsOneByteRepresentation());
 
-  FlattenString(string);
-  i::Handle<i::String> flat_string = FlattenGetString(string);
+  i::Handle<i::String> flat_string = i::String::Flatten(string);
 
   CHECK(string->IsOneByteRepresentation());
   CHECK(flat_string->IsOneByteRepresentation());
 
   // Create external resource.
   uint16_t* uc16_buffer = new uint16_t[length + 1];
 
   i::String::WriteToFlat(*flat_string, uc16_buffer, 0, length);
   uc16_buffer[length] = 0;
 
@@ skipping 3443 matching lines @@
              "f.call(friend);");
   CHECK_EQ(2, named_access_count);
 
   // Test access using Object.setPrototypeOf reflective method.
   named_access_count = 0;
   CompileRun("Object.setPrototypeOf(friend, {});");
   CHECK_EQ(1, named_access_count);
   CompileRun("Object.getPrototypeOf(friend);");
   CHECK_EQ(2, named_access_count);
 }