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

content/renderer/browser_plugin/browser_plugin_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 CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
 #define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
 
 #include "base/id_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 20 matching lines @@
  public:
   // Returns the one BrowserPluginManager for this process.
   static BrowserPluginManager* Create(RenderViewImpl* render_view);
 
   // Overrides factory for testing. Default (NULL) value indicates regular
   // (non-test) environment.
   static void set_factory_for_testing(BrowserPluginManagerFactory* factory) {
     BrowserPluginManager::factory_ = factory;
   }
 
-  BrowserPluginManager(RenderViewImpl* render_view);
+  explicit BrowserPluginManager(RenderViewImpl* render_view);
 
   // Creates a new BrowserPlugin object with a unique identifier.
   // BrowserPlugin is responsible for associating itself with the
   // BrowserPluginManager via AddBrowserPlugin. When it is destroyed, it is
   // responsible for removing its association via RemoveBrowserPlugin.
   virtual BrowserPlugin* CreateBrowserPlugin(
       RenderViewImpl* render_view,
       WebKit::WebFrame* frame,
       const WebKit::WebPluginParams& params) = 0;
 
@@ skipping 23 matching lines @@
 
   virtual ~BrowserPluginManager();
   IDMap<BrowserPlugin> instances_;
   base::WeakPtr<RenderViewImpl> render_view_;
   int browser_plugin_counter_;
 };
 
 }  // namespace content
 
 #endif //  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_