Purge the App Launcher code from Windows.

ui/app_list/views/cached_label.cc

 // Copyright 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 "ui/app_list/views/cached_label.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "ui/base/layout.h"
 #include "ui/gfx/canvas.h"
@@ skipping 19 matching lines @@
     canvas.FillRect(
         GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode);
   }
 
   Label::OnPaint(&canvas);
 
   image_ = gfx::ImageSkia(canvas.ExtractImageRep());
   needs_repaint_ = false;
 }
 
-#if defined(OS_WIN)
-void CachedLabel::OnPaint(gfx::Canvas* canvas) {
-  PaintToBackingImage();
-  canvas->DrawImageInt(image_, 0, 0);
-}
-#endif
-
 void CachedLabel::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   Invalidate();
   Label::OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
 }  // namespace app_list