chromeos: Stop calling gdata::GDataCache::GetCacheEntry on UI thread

chrome/browser/chromeos/gdata/gdata_cache.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/chromeos/gdata/gdata_cache.h"
 
 #include <vector>
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/file_util.h"
@@ skipping 1194 matching lines @@
   CacheMap::iterator iter = cache_map_.find(resource_id);
   if (iter != cache_map_.end()) {
     // Delete the CacheEntry and remove it from the map.
     cache_map_.erase(iter);
   }
 }
 
 scoped_ptr<GDataCache::CacheEntry> GDataCacheMap::GetCacheEntry(
     const std::string& resource_id,
     const std::string& md5) {
-  // TODO(satorux): Enable this once all callers are fixed: crbug.com/131826.
-  // AssertOnSequencedWorkerPool();
+  AssertOnSequencedWorkerPool();
 
   CacheMap::iterator iter = cache_map_.find(resource_id);
   if (iter == cache_map_.end()) {
     DVLOG(1) << "Can't find " << resource_id << " in cache map";
     return scoped_ptr<CacheEntry>();
   }
 
   scoped_ptr<CacheEntry> cache_entry(new CacheEntry(iter->second));
 
   // If entry is not dirty, it's only valid if matches with non-empty |md5|.
@@ skipping 104 matching lines @@
       cache_base_path.Append(chrome::kGDataCacheDirname);
   return cache_root_path.Append(kGDataCacheVersionDir);
 }
 
 void SetFreeDiskSpaceGetterForTesting(FreeDiskSpaceGetterInterface* getter) {
   delete global_free_disk_getter_for_testing;  // Safe to delete NULL;
   global_free_disk_getter_for_testing = getter;
 }
 
 }  // namespace gdata