NTP: Extract JSON requests from Fetcher.

components/ntp_snippets/remote/remote_suggestions_provider_unittest.cc

 // Copyright 2015 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/ntp_snippets/remote/remote_suggestions_provider.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 287 matching lines @@
                                     [](base::Closure signal, gfx::Image* output,
                                        const gfx::Image& loaded) {
                                       *output = loaded;
                                       signal.Run();
                                     },
                                     run_loop.QuitClosure(), &result));
   run_loop.Run();
   return result;
 }
 
-void ParseJson(
-    const std::string& json,
-    const ntp_snippets::NTPSnippetsFetcher::SuccessCallback& success_callback,
-    const ntp_snippets::NTPSnippetsFetcher::ErrorCallback& error_callback) {
+void ParseJson(const std::string& json,
+               const SuccessCallback& success_callback,
+               const ErrorCallback& error_callback) {
   base::JSONReader json_reader;
   std::unique_ptr<base::Value> value = json_reader.ReadToValue(json);
   if (value) {
     success_callback.Run(std::move(value));
   } else {
     error_callback.Run(json_reader.GetErrorMessage());
   }
 }
 
 // Factory for FakeURLFetcher objects that always generate errors.
@@ skipping 1502 matching lines @@
   service->FetchSnippetsInTheBackground();
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(
       simple_test_clock_ptr->Now().ToInternalValue(),
       pref_service()->GetInt64(prefs::kLastSuccessfulBackgroundFetchTime));
   // TODO(markusheintz): Add a test that simulates a browser restart once the
   // scheduler refactoring is done (crbug.com/672434).
 }
 
 }  // namespace ntp_snippets