remove remaining uses of default isolate in tests

test/cctest/test-regexp.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 385 matching lines @@
   RegExpCompileData result;
   CHECK(!v8::internal::RegExpParser::ParseRegExp(
       &reader, false, &result, &zone));
   CHECK(result.tree == NULL);
   CHECK(!result.error.is_null());
   SmartArrayPointer<char> str = result.error->ToCString(ALLOW_NULLS);
   CHECK_EQ(expected, *str);
 }
 
 
-UNINITIALIZED_TEST(Errors) {
-  V8::Initialize(NULL);
+TEST(Errors) {
   const char* kEndBackslash = "\\ at end of pattern";
   ExpectError("\\", kEndBackslash);
   const char* kUnterminatedGroup = "Unterminated group";
   ExpectError("(foo", kUnterminatedGroup);
   const char* kInvalidGroup = "Invalid group";
   ExpectError("(?", kInvalidGroup);
   const char* kUnterminatedCharacterClass = "Unterminated character class";
   ExpectError("[", kUnterminatedCharacterClass);
   ExpectError("[a-", kUnterminatedCharacterClass);
   const char* kNothingToRepeat = "Nothing to repeat";
@@ skipping 1392 matching lines @@
   ZoneList<CharacterRange> first_only(4, &zone);
   ZoneList<CharacterRange> second_only(4, &zone);
   ZoneList<CharacterRange> both(4, &zone);
 }
 
 
 TEST(Graph) {
   V8::Initialize(NULL);
   Execute("\\b\\w+\\b", false, true, true);
 }