Implement handlified String::Equals and Name::Equals.

src/json-parser.h

 // Copyright 2011 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 521 matching lines @@
     if (c0_ < '0' || c0_ > '9') return ReportUnexpectedCharacter();
     do {
       Advance();
     } while (c0_ >= '0' && c0_ <= '9');
   }
   int length = position_ - beg_pos;
   double number;
   if (seq_ascii) {
     Vector<const uint8_t> chars(seq_source_->GetChars() +  beg_pos, length);
     number = StringToDouble(isolate()->unicode_cache(),
-                             Vector<const char>::cast(chars),
-                             NO_FLAGS,  // Hex, octal or trailing junk.
-                             OS::nan_value());
+                            chars,
+                            NO_FLAGS,  // Hex, octal or trailing junk.
+                            OS::nan_value());
   } else {
     Vector<uint8_t> buffer = Vector<uint8_t>::New(length);
     String::WriteToFlat(*source_, buffer.start(), beg_pos, position_);
     Vector<const uint8_t> result =
         Vector<const uint8_t>(buffer.start(), length);
     number = StringToDouble(isolate()->unicode_cache(),
-                            // TODO(dcarney): Convert StringToDouble to uint_t.
-                            Vector<const char>::cast(result),
+                            result,
                             NO_FLAGS,  // Hex, octal or trailing junk.
                             0.0);
     buffer.Dispose();
   }
   SkipWhitespace();
   return factory()->NewNumber(number, pretenure_);
 }
 
 
 template <typename StringType>
@@ skipping 234 matching lines @@
 
   ASSERT_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_