IWYU fixes for url/...

url/url_canon_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
-#include <stddef.h>
+#include <ostream>
+#include <string>
 
 #include "base/macros.h"
+#include "testing/gtest/include/gtest/gtest-death-test.h"
+#include "testing/gtest/include/gtest/gtest-message.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/third_party/mozilla/url_parse.h"
 #include "url/url_canon.h"
 #include "url/url_canon_internal.h"
 #include "url/url_canon_stdstring.h"
 #include "url/url_test_utils.h"
 
 namespace url {
 
 using test_utils::WStringToUTF16;
@@ skipping 2140 matching lines @@
   repl_output.Complete();
 
   // Generate the expected string and check.
   std::string expected("file:///foo?");
   for (size_t i = 0; i < new_query.length(); i++)
     expected.push_back('a');
   EXPECT_TRUE(expected == repl_str);
 }
 
 }  // namespace url