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

chrome/browser/ui/webui/about_ui.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_UI_WEBUI_ABOUT_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_ABOUT_UI_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 25 matching lines @@
  private:
   virtual ~AboutUIHTMLSource();
 
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutUIHTMLSource);
 };
 
 class AboutUI : public content::WebUIController {
  public:
-  explicit AboutUI(content::WebUI* web_ui, const std::string& host);
+  AboutUI(content::WebUI* web_ui, const std::string& host);
   virtual ~AboutUI() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AboutUI);
 };
 
 namespace about_ui {
 
 // Helper functions
 void AppendHeader(std::string* output, int refresh,
                   const std::string& unescaped_title);
 void AppendBody(std::string *output);
 void AppendFooter(std::string *output);
 
 }  // namespace about_ui
 
 #endif  // CHROME_BROWSER_UI_WEBUI_ABOUT_UI_H_