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

chrome/browser/ui/webui/extensions/extension_info_ui.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_UI_WEBUI_EXTENSIONS_EXTENSION_INFO_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_INFO_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 #include "googleurl/src/gurl.h"
 
 class ChromeWebUIDataSource;
 
 namespace base {
 class ListValue;
 }
 
 // WebUI controller for the informative bubble shown on clicking a script badge.
 class ExtensionInfoUI : public content::WebUIController {
  public:
-  explicit ExtensionInfoUI(content::WebUI* web_ui, const GURL& url);
+  ExtensionInfoUI(content::WebUI* web_ui, const GURL& url);
 
   // Returns the chrome://extension-info/ URL for this extension.
   static GURL GetURL(const std::string& extension_id);
 
  private:
   virtual ~ExtensionInfoUI();
 
   // Load details about the extension into source_. Called during construction.
   void AddExtensionDataToSource(const std::string& extension_id);
 
   ChromeWebUIDataSource* source_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInfoUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_INFO_UI_H_