Turn on file access checks on Win.

chrome/browser/themes/browser_theme_pack.cc

 // Copyright (c) 2010 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 "app/resource_bundle.h"
 #include "base/data_pack.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
+#include "base/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/themes/browser_theme_provider.h"
 #include "gfx/codec/png_codec.h"
 #include "gfx/skbitmap_operations.h"
 #include "grit/app_resources.h"
 #include "grit/theme_resources.h"
 #include "net/base/file_stream.h"
 #include "net/base/net_errors.h"
@@ skipping 814 matching lines @@
   }
 
   source_images_ = new int[ids.size() + 1];
   std::copy(ids.begin(), ids.end(), source_images_);
   source_images_[ids.size()] = -1;
 }
 
 bool BrowserThemePack::LoadRawBitmapsTo(
     const FilePathMap& file_paths,
     ImageCache* raw_bitmaps) {
+  // Themes should be loaded on the file thread, not the UI thread.
+  // http://crbug.com/61838
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+
   for (FilePathMap::const_iterator it = file_paths.begin();
        it != file_paths.end(); ++it) {
     scoped_refptr<RefCountedMemory> raw_data(ReadFileData(it->second));
     if (!raw_data.get()) {
       LOG(ERROR) << "Could not load theme image";
       return false;
     }
 
     int id = it->first;
 
@@ skipping 181 matching lines @@
         hsl.h = tints_[i].h;
         hsl.s = tints_[i].s;
         hsl.l = tints_[i].l;
         return hsl;
       }
     }
   }
 
   return BrowserThemeProvider::GetDefaultTint(id);
 }