More style nits.

chrome/browser/gtk/download_started_animation_gtk.cc

 // Copyright (c) 2009 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.
 
 #include "chrome/browser/download/download_started_animation.h"
 
 #include <gtk/gtk.h>
 
 #include "app/animation.h"
 #include "app/resource_bundle.h"
@@ skipping 13 matching lines @@
 const int kFrameRateHz = 60;
 
 // What fraction of the frame height to move downward from the frame center.
 // Note that setting this greater than 0.5 will mean moving past the bottom of
 // the frame.
 const double kMoveFraction = 1.0 / 3.0;
 
 class DownloadStartedAnimationGtk : public Animation,
                                     public NotificationObserver {
  public:
-  DownloadStartedAnimationGtk(TabContents* tab_contents);
+  explicit DownloadStartedAnimationGtk(TabContents* tab_contents);
 
   // DownloadStartedAnimation will delete itself, but this is public so
   // that we can use DeleteSoon().
   virtual ~DownloadStartedAnimationGtk();
 
  private:
   // Move the arrow to wherever it should currently be.
   void Reposition();
 
   // Shut down cleanly.
@@ skipping 140 matching lines @@
   Close();
 }
 
 }  // namespace
 
 // static
 void DownloadStartedAnimation::Show(TabContents* tab_contents) {
   // The animation will delete itself.
   new DownloadStartedAnimationGtk(tab_contents);
 }