Change chrome:// favicons in tabstrip based on theming.

chrome/browser/ui/cocoa/download/background_theme.mm

 // 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/ui/cocoa/download/background_theme.h"
 
 #import "chrome/browser/themes/theme_properties.h"
 
 BackgroundTheme::BackgroundTheme(const ui::ThemeProvider* provider)
     : provider_(provider) {
@@ skipping 29 matching lines @@
 }
 
 gfx::ImageSkia* BackgroundTheme::GetImageSkiaNamed(int id) const {
   return NULL;
 }
 
 SkColor BackgroundTheme::GetColor(int id) const {
   return SkColor();
 }
 
+color_utils::HSL BackgroundTheme::GetTint(int id) const {
+  return color_utils::HSL();
+}
+
 int BackgroundTheme::GetDisplayProperty(int id) const {
   return -1;
 }
 
 bool BackgroundTheme::ShouldUseNativeFrame() const {
   return false;
 }
 
 bool BackgroundTheme::HasCustomImage(int id) const {
   return false;
@@ skipping 33 matching lines @@
     case ThemeProperties::GRADIENT_TOOLBAR_BUTTON_PRESSED_INACTIVE:
       return buttonPressedGradient_.get();
     default:
       return provider_->GetNSGradient(id);
   }
 }
 
 bool BackgroundTheme::ShouldIncreaseContrast() const {
   return false;
 }