Create a --disable-top-sites flag for use by telemetry tests

components/history/core/browser/top_sites_cache.cc

 // Copyright (c) 2012 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/history/core/browser/top_sites_cache.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 
 namespace history {
 
 TopSitesCache::CanonicalURLQuery::CanonicalURLQuery(const GURL& url) {
   most_visited_url_.redirects.push_back(url);
   entry_.first = &most_visited_url_;
   entry_.second = 0u;
 }
 
 TopSitesCache::CanonicalURLQuery::~CanonicalURLQuery() {
 }
 
-TopSitesCache::TopSitesCache() {
+TopSitesCache::TopSitesCache() : num_forced_urls_(0) {
   clear_query_ref_.ClearQuery();
   clear_query_ref_.ClearRef();
   clear_path_query_ref_.ClearQuery();
   clear_path_query_ref_.ClearRef();
   clear_path_query_ref_.ClearPath();
 }
 
 TopSitesCache::~TopSitesCache() {
 }
 
@@ skipping 141 matching lines @@
   return canonical_urls_.find(CanonicalURLQuery(url).entry());
 }
 
 const GURL& TopSitesCache::GetURLFromIterator(
     CanonicalURLs::const_iterator it) const {
   DCHECK(it != canonical_urls_.end());
   return it->first.first->redirects[it->first.second];
 }
 
 }  // namespace history