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

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index e645678ff9011c38b5d45fe26e1c2646ceb620f3..5680acf4b07b962c25efa1906d60ad6c7a289894 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -1367,7 +1367,7 @@ void TestParserSyncWithFlags(i::Handle<i::String> source,
     }
     // Check that preparser and parser produce the same error.
     i::Handle<i::String> preparser_message = FormatMessage(&data);
-    if (!message_string->Equals(*preparser_message)) {
+    if (!i::String::Equals(message_string, preparser_message)) {
       i::OS::Print(
           "Expected parser and preparser to produce the same error on:\n"
           "\t%s\n"