Fix "unused variable" warnings.

chrome/browser/extensions/extension_action_icon_factory.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.
 
 #include "chrome/browser/extensions/extension_action_icon_factory.h"
 
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/profiles/profile.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 
 using extensions::Extension;
 using extensions::IconImage;
 
 ExtensionActionIconFactory::ExtensionActionIconFactory(
     Profile* profile,
     const Extension* extension,
     ExtensionAction* action,
     Observer* observer)
-    : extension_(extension),
-      action_(action),
-      observer_(observer),
-      icon_image_observer_(this) {
+    : action_(action), observer_(observer), icon_image_observer_(this) {
   extensions::IconImage* default_icon_image =
       action->LoadDefaultIconImage(*extension, profile);
   if (default_icon_image)
     icon_image_observer_.Add(default_icon_image);
 }
 
 ExtensionActionIconFactory::~ExtensionActionIconFactory() {}
 
 // extensions::IconImage::Observer overrides.
 void ExtensionActionIconFactory::OnExtensionIconImageChanged(IconImage* image) {
@@ skipping 10 matching lines @@
   gfx::Image icon = action_->GetExplicitlySetIcon(tab_id);
   if (!icon.IsEmpty())
     return icon;
 
   icon = action_->GetDeclarativeIcon(tab_id);
   if (!icon.IsEmpty())
     return icon;
 
   return action_->GetDefaultIconImage();
 }