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

chrome/common/extensions/permissions/api_permission_set.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_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_SET_H_
 #define CHROME_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_SET_H_
 
 #include <iterator>
 #include <map>
 
 #include "base/memory/linked_ptr.h"
 #include "chrome/common/extensions/permissions/api_permission.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
 namespace extensions {
 
 class Extension;
 
 typedef std::map<APIPermission::ID,
   linked_ptr<APIPermission> > APIPermissionMap;
 
 class APIPermissionSet {
  public:
   class const_iterator :
     public std::iterator<std::input_iterator_tag, const APIPermission*> {
    public:
-    const_iterator(const APIPermissionMap::const_iterator& it);
+    explicit const_iterator(const APIPermissionMap::const_iterator& it);
     const_iterator(const const_iterator& ids_it);
 
     const_iterator& operator++() {
       ++it_;
       return *this;
     }
 
     const_iterator operator++(int) {
       const_iterator tmp(it_++);
       return tmp;
@@ skipping 23 matching lines @@
 
   APIPermissionSet(const APIPermissionSet& set);
 
   ~APIPermissionSet();
 
   const_iterator begin() const {
     return const_iterator(map().begin());
   }
 
   const_iterator end() const {
-    return map().end();
+    return const_iterator(map().end());
   }
 
   const_iterator find(APIPermission::ID id) const {
-    return map().find(id);
+    return const_iterator(map().find(id));
   }
 
   const APIPermissionMap& map() const {
     return map_;
   }
 
   APIPermissionMap& map() {
     return map_;
   }
 
@@ skipping 60 matching lines @@
       string16* error,
       std::vector<std::string>* unhandled_permissions);
 
  private:
   APIPermissionMap map_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_SET_H_