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

chrome/renderer/extensions/native_handler.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_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_
 #define CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_
 
 #include "base/bind.h"
 #include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"
 
 #include <string>
 #include <vector>
 
 namespace extensions {
 
 // A NativeHandler is a factory for JS objects with functions on them that map
 // to native C++ functions. Subclasses should call RouteFunction() in their
 // constructor to define functions on the created JS objects.
 //
 // NativeHandlers are intended to be used with a ModuleSystem. The ModuleSystem
 // will assume ownership of the NativeHandler, and as a ModuleSystem is tied to
 // a single v8::Context, this implies that NativeHandlers will also be tied to
 // a single v8::context.
 // TODO(koz): Rename this to NativeJavaScriptModule.
 class NativeHandler {
  public:
-  explicit NativeHandler();
+  NativeHandler();
   virtual ~NativeHandler();
 
   // Create an object with bindings to the native functions defined through
   // RouteFunction().
   virtual v8::Handle<v8::Object> NewInstance();
 
  protected:
   typedef v8::Handle<v8::Value> (*HandlerFunc)(const v8::Arguments&);
   typedef base::Callback<v8::Handle<v8::Value>(const v8::Arguments&)>
       HandlerFunction;
@@ skipping 12 matching lines @@
 
   std::vector<linked_ptr<HandlerFunction> > handler_functions_;
   v8::Persistent<v8::ObjectTemplate> object_template_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeHandler);
 };
 
 }  // extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_