Change NTPSnippetsService to implement ContentSuggestionsProvider

components/ntp_snippets/content_suggestions_provider.cc

 // Copyright 2016 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/content_suggestions_provider.h"
 
 #include "base/strings/stringprintf.h"
 
 namespace ntp_snippets {
 
 namespace {
 
 const char kCombinedIDFormat[] = "%d:%s";
 
 }  // namespace
 
 ContentSuggestionsProvider::ContentSuggestionsProvider(
     const std::vector<ContentSuggestionsCategory>& provided_categories)
     : provided_categories_(provided_categories) {}
 
 ContentSuggestionsProvider::~ContentSuggestionsProvider() {}
 
 std::string ContentSuggestionsProvider::MakeUniqueID(
     ContentSuggestionsCategory category,
     const std::string& within_category_id) {
-  return base::StringPrintf(kCombinedIDFormat, int(category),
+  return base::StringPrintf(kCombinedIDFormat,
+                            static_cast<int>(category),
                             within_category_id.c_str());
 }
 
 }  // namespace ntp_snippets