Remove a few unused typedefs.

chrome/browser/themes/browser_theme_pack.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/browser_theme_pack.h"
 
 #include <limits>
 
 #include "base/files/file.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 1433 matching lines @@
       // ImageSkia takes ownership of |source|.
       temp_output[prs_id] = gfx::Image(gfx::ImageSkia(source,
           image_to_tint.size()));
     }
   }
   MergeImageCaches(temp_output, images);
 }
 
 void BrowserThemePack::RepackImages(const ImageCache& images,
                                     RawImages* reencoded_images) const {
-  typedef std::vector<ui::ScaleFactor> ScaleFactors;
   for (ImageCache::const_iterator it = images.begin();
        it != images.end(); ++it) {
     gfx::ImageSkia image_skia = *it->second.ToImageSkia();
 
     typedef std::vector<gfx::ImageSkiaRep> ImageSkiaReps;
     ImageSkiaReps image_reps = image_skia.image_reps();
     if (image_reps.empty()) {
       NOTREACHED() << "No image reps for resource " << it->first << ".";
     }
     for (ImageSkiaReps::iterator rep_it = image_reps.begin();
@@ skipping 139 matching lines @@
                                            false,
                                            &bitmap_data)) {
       NOTREACHED() << "Unable to encode theme image for prs_id="
                    << prs_id << " for scale_factor=" << scale_factors_[i];
       break;
     }
     image_memory_[scaled_raw_id] =
         base::RefCountedBytes::TakeVector(&bitmap_data);
   }
 }