Remove stale-while-revalidate experimental implementation.

net/http/http_cache.h

Index: net/http/http_cache.h
diff --git a/net/http/http_cache.h b/net/http/http_cache.h
index 8e99a98d3dc861308dfb9a866b29c133535bf515..a58a29385656b4883cfa6b1e9a0c55062290f4bb 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -15,7 +15,6 @@
 #define NET_HTTP_HTTP_CACHE_H_
 
 #include <list>
-#include <map>
 #include <set>
 #include <string>
 
@@ -211,16 +210,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
     fail_conditionalization_for_test_ = true;
   }
 
-  bool use_stale_while_revalidate() const {
-    return use_stale_while_revalidate_;
-  }
-
-  // Enable stale_while_revalidate functionality for testing purposes.
-  void set_use_stale_while_revalidate_for_testing(
-      bool use_stale_while_revalidate) {
-    use_stale_while_revalidate_ = use_stale_while_revalidate;
-  }
-
   // HttpTransactionFactory implementation:
   int CreateTransaction(RequestPriority priority,
                         scoped_ptr<HttpTransaction>* trans) override;
@@ -257,11 +246,9 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
   friend class Transaction;
   friend class ViewCacheHelper;
   struct PendingOp;  // Info for an entry under construction.
-  class AsyncValidation;  // Encapsulates a single async revalidation.
 
   typedef std::list<Transaction*> TransactionList;
   typedef std::list<WorkItem*> WorkItemList;
-  typedef std::map<std::string, AsyncValidation*> AsyncValidationMap;
 
   struct ActiveEntry {
     explicit ActiveEntry(disk_cache::Entry* entry);
@@ -396,15 +383,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
   // Resumes processing the pending list of |entry|.
   void ProcessPendingQueue(ActiveEntry* entry);
 
-  // Called by Transaction to perform an asynchronous revalidation. Creates a
-  // new independent transaction as a copy of the original.
-  void PerformAsyncValidation(const HttpRequestInfo& original_request,
-                              const BoundNetLog& net_log);
-
-  // Remove the AsyncValidation with url |url| from the |async_validations_| set
-  // and delete it.
-  void DeleteAsyncValidation(const std::string& url);
-
   // Events (called via PostTask) ---------------------------------------------
 
   void OnProcessPendingQueue(ActiveEntry* entry);
@@ -437,10 +415,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
   bool bypass_lock_for_test_;
   bool fail_conditionalization_for_test_;
 
-  // true if the implementation of Cache-Control: stale-while-revalidate
-  // directive is enabled (either via command-line flag or experiment).
-  bool use_stale_while_revalidate_;
-
   Mode mode_;
 
   scoped_ptr<QuicServerInfoFactoryAdaptor> quic_server_info_factory_;
@@ -462,9 +436,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
 
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
-  // The async validations currently in progress, keyed by URL.
-  AsyncValidationMap async_validations_;
-
   // A clock that can be swapped out for testing.
   scoped_ptr<base::Clock> clock_;