[Refactor] Change FaviconService API to take in a desired pixel size

ui/message_center/message_center_style.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 UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/size.h"
 #include "ui/message_center/message_center_export.h"
 
 namespace message_center {
 
 // Exported values /////////////////////////////////////////////////////////////
 
 // Square image sizes in DIPs.
 const int kNotificationButtonIconSize = 16;
 const int kNotificationIconSize = 80;
 // A border is applied to images that have a non-preferred aspect ratio.
 const int kNotificationImageBorderSize = 10;
 const int kNotificationPreferredImageWidth = 360;
 const int kNotificationPreferredImageHeight = 240;
-const int kSettingsIconSize = 16;
 const int kSmallImageSize = 16;
 const int kSmallImagePadding = 4;
 
 // Limits.
 const size_t kMaxVisibleMessageCenterNotifications = 100;
 const size_t kMaxVisiblePopupNotifications = 3;
 
 // DIP dimension; H size of the whole card.
 const int kNotificationWidth = 360;
 const int kMinScrollViewHeight = 100;
@@ skipping 94 matching lines @@
 
 extern const SkColor kShadowColor;           // Shadow in the tray.
 
 extern const SkColor kMessageCenterBackgroundColor;
 extern const SkColor kFooterDelimiterColor;  // Separator color for the tray.
 extern const SkColor kFooterTextColor;       // Text color for tray labels.
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_