Implement i18n::addressinput::Downloader for requestAutocomplete() (and

components/autofill/core/browser/validation_downloader.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 "components/autofill/core/browser/validation_downloader.h"
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/url_request/url_fetcher.h"
+
+namespace autofill {
+
+ValidationDownloader::ValidationDownloader(net::UrlRequestContextGetter* getter)
+    : getter_(getter) {}
+
+ValidationDownloader::~ValidationDownloader() {}

[please use gerrit instead, 2013/12/02 17:33:26]

Please invoke the remaining |callbacks_| with parameters (false, url,
std::string()) before deleting them. This will ensure that libaddressinput
cleans up its resources.

+
+void ValidationDownloader::Download(
+    const std::string& url,
+    const i18n::addressinput::Downloader::Callback& downloaded) {
+  net::URLFetcher* fetcher(

[Evan Stade, 2013/12/02 21:50:04]

The entirety of this function should be:

  new I18nDownloadRequest(url, callback);

And all the actual functionality is handled in the I18nDownloadRequest class.

+      net::URLFetcher::Create(GURL(url), net::URLFetcher::GET, this));
+  fetchers_.push_back(fetcher);
+  fetcher->SetRequestContext(getter_);

[Evan Stade, 2013/12/04 20:23:38]

Also you will want:

  fetcher->SetLoadFlags(
      net::LOAD_DO_NOT_SEND_COOKIES | net::LOAD_DO_NOT_SAVE_COOKIES);

+  callbacks_[fetcher] = downloaded;
+  fetcher->Start();
+}
+
+void ValidationDownloader::OnURLFetchComplete(const net::URLFetcher* source) {
+  DCHECK(fetchers_.find(source) != fetchers_.end());
+
+  CallbackMap::iterator it = callbacks_.find(source);
+  if (it == callbacks_.end()) {
+    NOTREACHED();
+    return;
+  }
+
+  bool ok = source->GetReponseCode() == net::HTTP_OK;
+  std::string url = source->GetOriginalURL().spec();
+  (it->second)(ok, url, ok ? source->GetResponseAsString() : std::string());
+  callbacks_.erase(it);
+
+  // |source| is owned by |fetchers_| and will be deleted later.

[please use gerrit instead, 2013/12/02 17:03:54]

You could also do:

  fetchers_.erase(source);

+}
+
+}  // namespace autofill