Use the previews black list for offline previews

chrome/browser/profiles/profile_impl_io_data.h

Index: chrome/browser/profiles/profile_impl_io_data.h
diff --git a/chrome/browser/profiles/profile_impl_io_data.h b/chrome/browser/profiles/profile_impl_io_data.h
index bb7070509681247c68a226986f4da9590bd1937a..89197b5e396a9e6c615750f677f8b59d517602f7 100644
--- a/chrome/browser/profiles/profile_impl_io_data.h
+++ b/chrome/browser/profiles/profile_impl_io_data.h
@@ -35,20 +35,24 @@ class CookieStore;
 class FtpTransactionFactory;
 class HttpNetworkSession;
 class HttpServerProperties;
 class HttpServerPropertiesManager;
 class HttpTransactionFactory;
 class ProxyConfig;
 class SdchManager;
 class SdchOwner;
 }  // namespace net
 
+namespace previews {
+class PreviewsIOData;
+}
+
 namespace storage {
 class SpecialStoragePolicy;
 }  // namespace storage
 
 class ProfileImplIOData : public ProfileIOData {
  public:
   class Handle {
    public:
     explicit Handle(Profile* profile);
     ~Handle();
@@ -232,19 +236,21 @@ class ProfileImplIOData : public ProfileIOData {
 
   mutable std::unique_ptr<net::URLRequestJobFactory> main_job_factory_;
   mutable std::unique_ptr<net::URLRequestJobFactory> extensions_job_factory_;
 
   mutable std::unique_ptr<domain_reliability::DomainReliabilityMonitor>
       domain_reliability_monitor_;
 
   mutable std::unique_ptr<net::SdchManager> sdch_manager_;
   mutable std::unique_ptr<net::SdchOwner> sdch_policy_;
 
+  mutable std::unique_ptr<previews::PreviewsIOData> previews_io_data_;
+
   // Parameters needed for isolated apps.
   base::FilePath profile_path_;
   int app_cache_max_size_;
   int app_media_cache_max_size_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImplIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_IO_DATA_H_