Remove explicit keyword from multi-argument constructors

chrome/browser/chromeos/status/status_area_button.h

 // Copyright (c) 2011 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_CHROMEOS_STATUS_STATUS_AREA_BUTTON_H_
 #define CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_BUTTON_H_
 #pragma once
 
 #include "chrome/browser/chromeos/status/status_area_host.h"
 #include "views/controls/button/menu_button.h"
 #include "views/controls/menu/view_menu_delegate.h"
 
 namespace chromeos {
 
 // Button to be used to represent status and allow menus to be popped up.
 // Shows current button state by drawing a border around the current icon.
 class StatusAreaButton : public views::MenuButton {
  public:
-  explicit StatusAreaButton(StatusAreaHost* host,
-                            views::ViewMenuDelegate* menu_delegate);
+  StatusAreaButton(StatusAreaHost* host,
+                   views::ViewMenuDelegate* menu_delegate);
   virtual ~StatusAreaButton() {}
   virtual void PaintButton(gfx::Canvas* canvas, PaintButtonMode mode);
 
   // Overrides TextButton's SetText to clear max text size before seting new
   // text content so that the button size would fit the new text size.
   virtual void SetText(const std::wstring& text);
 
   void set_use_menu_button_paint(bool use_menu_button_paint) {
     use_menu_button_paint_ = use_menu_button_paint;
   }
@@ skipping 37 matching lines @@
 
  private:
   void UpdateTextStyle();
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaButton);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_BUTTON_H_