IWYU fixes for url/...

url/url_canon_host.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 "base/logging.h"
+#include "base/strings/string16.h"
+#include "url/third_party/mozilla/url_parse.h"
 #include "url/url_canon.h"
 #include "url/url_canon_internal.h"
 
 namespace url {
 
 namespace {
 
 // For reference, here's what IE supports:
 // Key: 0 (disallowed: failure if present in the input)
 //      + (allowed either escaped or unescaped, and unmodified)
@@ skipping 374 matching lines @@
 }
 
 void CanonicalizeHostVerbose(const base::char16* spec,
                              const Component& host,
                              CanonOutput* output,
                              CanonHostInfo* host_info) {
   DoHost<base::char16, base::char16>(spec, host, output, host_info);
 }
 
 }  // namespace url