Add missing (and remove superfluous) 'explicit' from constructors.

chrome/browser/browsing_data/cookies_tree_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_
 #define CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_
 
 // TODO(viettrungluu): This header file #includes far too much and has too much
 // inline code (which shouldn't be inline).
 
@@ skipping 265 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(CookieTreeCookiesNode);
 };
 
 // CookieTreeAppCacheNode -----------------------------------------------------
 class CookieTreeAppCacheNode : public CookieTreeNode {
  public:
   friend class CookieTreeAppCachesNode;
 
   // appcache_info should remain valid at least as long as the
   // CookieTreeAppCacheNode is valid.
-  explicit CookieTreeAppCacheNode(
+  CookieTreeAppCacheNode(
       const GURL& origin_url,
       std::list<appcache::AppCacheInfo>::iterator appcache_info);
   virtual ~CookieTreeAppCacheNode();
 
   virtual void DeleteStoredObjects() OVERRIDE;
   virtual DetailedInfo GetDetailedInfo() const OVERRIDE;
 
  private:
   GURL origin_url_;
   std::list<appcache::AppCacheInfo>::iterator appcache_info_;
@@ skipping 429 matching lines @@
   // Otherwise, use the CanonicalCookie::Domain attribute.
   bool group_by_cookie_source_;
 
   // If this is non-zero, then this model is batching updates (there's a lot of
   // notifications coming down the pipe). This is an integer is used to balance
   // calls to Begin/EndBatch() if they're called in a nested manner.
   int batch_update_;
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_