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

webkit/glue/webthread_impl.cc

 // 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.
 
 // An implementation of WebThread in terms of base::MessageLoop and
 // base::Thread
 
 #include "webkit/glue/webthread_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop.h"
 #include "base/threading/platform_thread.h"
 
 namespace webkit_glue {
 
 WebThreadBase::WebThreadBase() { }
 WebThreadBase::~WebThreadBase() { }
 
 class WebThreadBase::TaskObserverAdapter : public MessageLoop::TaskObserver {
 public:
-  TaskObserverAdapter(WebThread::TaskObserver* observer)
+  explicit TaskObserverAdapter(WebThread::TaskObserver* observer)
       : observer_(observer) { }
 
   virtual void WillProcessTask(base::TimeTicks) OVERRIDE {
     observer_->willProcessTask();
   }
 
   virtual void DidProcessTask(base::TimeTicks) OVERRIDE {
     observer_->didProcessTask();
   }
 
@@ skipping 89 matching lines @@
 }
 
 bool WebThreadImplForMessageLoop::IsCurrentThread() const {
   return message_loop_->BelongsToCurrentThread();
 }
 
 WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {
 }
 
 }