Use vectorized icon for default extensions icons

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

 // Copyright (c) 2013 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/libgtk2ui/native_theme_gtk2.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_menu_subclasses.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
@@ skipping 399 matching lines @@
     case kColorId_ThrobberSpinningColor:
     case kColorId_ThrobberLightColor: {
       return GetEntryStyle()->bg[GTK_STATE_SELECTED];
     }
 
     case kColorId_ThrobberWaitingColor: {
       return GdkAlphaBlend(GetEntryStyle()->bg[GTK_STATE_SELECTED],
                            GetWindowStyle()->bg[GTK_STATE_NORMAL], 0xff / 2);
     }
 
+    case kColorId_ChromeIconGrey:
     case kColorId_NumColors:
       NOTREACHED();
       break;
   }
 
   return SkColorToGdkColor(kInvalidColorIdColor);
 }
 
 GtkWidget* NativeThemeGtk2::GetRealizedWindow() const {
   if (!fake_window_) {
@@ skipping 100 matching lines @@
                                                0, 0,
                                                rect.width(), rect.height());
   SkBitmap arrow = GdkPixbufToImageSkia(pb);
   canvas->drawBitmap(arrow, rect.x(), rect.y());
 
   g_object_unref(pb);
   g_object_unref(pm);
 }
 
 }  // namespace libgtk2ui