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

chrome/browser/background/background_mode_manager.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_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 
 #include <map>
 
 #include "base/gtest_prod_util.h"
@@ skipping 70 matching lines @@
                            EnableAfterBackgroundAppInstall);
   FRIEND_TEST_ALL_PREFIXES(BackgroundModeManagerTest,
                            MultiProfile);
   FRIEND_TEST_ALL_PREFIXES(BackgroundModeManagerTest,
                            ProfileInfoCacheStorage);
   FRIEND_TEST_ALL_PREFIXES(BackgroundModeManagerTest,
                            ProfileInfoCacheObserver);
 
   class BackgroundModeData : public ui::SimpleMenuModel::Delegate {
    public:
-    explicit BackgroundModeData(
+    BackgroundModeData(
         int command_id,
         Profile* profile);
     virtual ~BackgroundModeData();
 
     // The cached list of BackgroundApplications.
     scoped_ptr<BackgroundApplicationListModel> applications_;
 
     // Overrides from SimpleMenuModel::Delegate implementation.
     virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
     virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
@@ skipping 201 matching lines @@
   // app).
   bool keep_alive_for_test_;
 
   // Provides a command id for each profile as they are created.
   int current_command_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundModeManager);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_