Remove unused code, AstValueFactory::ConcatStrings.

test/cctest/test-ast.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 41 matching lines @@
   const int kElements = 100;
   for (int i = 0; i < kElements; i++) {
     list->Add(node);
   }
   CHECK_EQ(1 + kElements, list->length());
 
   list->Clear();
   CHECK_EQ(0, list->length());
   delete list;
 }
-
-TEST(ConcatStrings) {
-  v8::internal::AccountingAllocator allocator;
-  Zone zone(&allocator, ZONE_NAME);
-  AstValueFactory value_factory(&zone, 0);
-
-  const AstRawString* one_byte = value_factory.GetOneByteString("a");
-
-  uint16_t two_byte_buffer[] = {
-      0x3b1,
-  };
-  const AstRawString* two_byte = value_factory.GetTwoByteString(
-      Vector<const uint16_t>(two_byte_buffer, 1));
-
-  const AstRawString* expectation = value_factory.GetOneByteString("aa");
-  const AstRawString* result = value_factory.ConcatStrings(one_byte, one_byte);
-  CHECK(result->is_one_byte());
-  CHECK_EQ(expectation, result);
-
-  uint16_t expectation_buffer_one_two[] = {'a', 0x3b1};
-  expectation = value_factory.GetTwoByteString(
-      Vector<const uint16_t>(expectation_buffer_one_two, 2));
-  result = value_factory.ConcatStrings(one_byte, two_byte);
-  CHECK(!result->is_one_byte());
-  CHECK_EQ(expectation, result);
-
-  uint16_t expectation_buffer_two_one[] = {0x3b1, 'a'};
-  expectation = value_factory.GetTwoByteString(
-      Vector<const uint16_t>(expectation_buffer_two_one, 2));
-  result = value_factory.ConcatStrings(two_byte, one_byte);
-  CHECK(!result->is_one_byte());
-  CHECK_EQ(expectation, result);
-
-  uint16_t expectation_buffer_two_two[] = {0x3b1, 0x3b1};
-  expectation = value_factory.GetTwoByteString(
-      Vector<const uint16_t>(expectation_buffer_two_two, 2));
-  result = value_factory.ConcatStrings(two_byte, two_byte);
-  CHECK(!result->is_one_byte());
-  CHECK_EQ(expectation, result);
-}