Render the tab close button as a vector-based icon.

chrome/browser/themes/theme_service.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/themes/theme_service.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 214 matching lines @@
     case Properties::COLOR_NTP_SECTION_HEADER_TEXT:
       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.30);
     case Properties::COLOR_NTP_SECTION_HEADER_TEXT_HOVER:
       return GetColor(Properties::COLOR_NTP_TEXT);
     case Properties::COLOR_NTP_SECTION_HEADER_RULE:
       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.70);
     case Properties::COLOR_NTP_SECTION_HEADER_RULE_LIGHT:
       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.86);
     case Properties::COLOR_NTP_TEXT_LIGHT:
       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.40);
-    case Properties::COLOR_TAB_ICON:
-      return color_utils::HSLShift(gfx::kChromeIconGrey,
-                                   GetTint(Properties::TINT_BUTTONS));
     case Properties::COLOR_THROBBER_SPINNING:
     case Properties::COLOR_THROBBER_WAITING: {
       SkColor base_color;
       bool found_color = ui::CommonThemeGetSystemColor(
           id == Properties::COLOR_THROBBER_SPINNING
               ? ui::NativeTheme::kColorId_ThrobberSpinningColor
               : ui::NativeTheme::kColorId_ThrobberWaitingColor,
           &base_color);
       DCHECK(found_color);
       color_utils::HSL hsl = GetTint(Properties::TINT_BUTTONS);
@@ skipping 438 matching lines @@
 void ThemeService::OnInfobarDestroyed() {
   number_of_infobars_--;
 
   if (number_of_infobars_ == 0)
     RemoveUnusedThemes(false);
 }
 
 ThemeSyncableService* ThemeService::GetThemeSyncableService() const {
   return theme_syncable_service_.get();
 }