Remove stale-while-revalidate from content and chrome

content/browser/loader/async_revalidation_manager.h

Index: content/browser/loader/async_revalidation_manager.h
diff --git a/content/browser/loader/async_revalidation_manager.h b/content/browser/loader/async_revalidation_manager.h
deleted file mode 100644
index facdb2d1452af6bcffdc073348fdafaf19418b65..0000000000000000000000000000000000000000
--- a/content/browser/loader/async_revalidation_manager.h
+++ /dev/null
@@ -1,107 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef CONTENT_BROWSER_LOADER_ASYNC_REVALIDATION_MANAGER_H_
-#define CONTENT_BROWSER_LOADER_ASYNC_REVALIDATION_MANAGER_H_
-
-#include <map>
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-
-class GURL;
-
-namespace net {
-class URLRequest;
-class HttpCache;
-}
-
-namespace content {
-
-class AsyncRevalidationDriver;
-class ResourceContext;
-class ResourceScheduler;
-struct ResourceRequest;
-
-// One instance of this class manages all active AsyncRevalidationDriver objects
-// for all profiles. It is created by and owned by
-// ResourceDispatcherHostImpl. It also implements the creation of a new
-// net::URLRequest and AsyncRevalidationDriver from an existing net::URLRequest
-// that has had the stale-while-revalidate algorithm applied to it.
-class AsyncRevalidationManager {
- public:
-  AsyncRevalidationManager();
-  ~AsyncRevalidationManager();
-
-  // Starts an async revalidation by copying |for_request|. |scheduler| must
-  // remain valid until this object is destroyed.
-  void BeginAsyncRevalidation(net::URLRequest* for_request,
-                              ResourceScheduler* scheduler);
-
-  // Cancel all pending async revalidations that use ResourceContext.
-  void CancelAsyncRevalidationsForResourceContext(
-      ResourceContext* resource_context);
-
-  static bool QualifiesForAsyncRevalidation(const ResourceRequest& request);
-
- private:
-  // The key of the map of pending async revalidations. This key has a distinct
-  // value for every in-progress async revalidation. It is used to avoid
-  // duplicate async revalidations, and also to cancel affected async
-  // revalidations when a ResourceContext is removed.
-  //
-  // Request headers are intentionally not included in the key for simplicity,
-  // as they usually don't affect caching.
-  //
-  // TODO(ricea): Behave correctly in cases where the request headers do make a
-  // difference. crbug.com/567721
-  struct AsyncRevalidationKey {
-    AsyncRevalidationKey(const ResourceContext* resource_context,
-                         const net::HttpCache* http_cache,
-                         const GURL& url);
-
-    // Create a prefix key that is used to match all of the
-    // AsyncRevalidationDrivers using |resource_context| in the map.
-    explicit AsyncRevalidationKey(const ResourceContext* resource_context);
-
-    // The key for a map needs to be copyable.
-    AsyncRevalidationKey(const AsyncRevalidationKey& rhs) = default;
-    ~AsyncRevalidationKey();
-
-    // No operator= is generated because the struct members are immutable.
-
-    // |resource_context| and |http_cache| are never dereferenced; they are only
-    // compared to other values.
-    const ResourceContext* const resource_context;
-
-    // There are multiple independent HttpCache objects per ResourceContext.
-    const net::HttpCache* const http_cache;
-
-    // Derived from the url via net::HttpUtil::SpecForRequest().
-    const std::string url_key;
-
-    struct LessThan {
-      bool operator()(const AsyncRevalidationKey& lhs,
-                      const AsyncRevalidationKey& rhs) const;
-    };
-  };
-
-  using AsyncRevalidationMap =
-      std::map<AsyncRevalidationKey,
-               std::unique_ptr<AsyncRevalidationDriver>,
-               AsyncRevalidationKey::LessThan>;
-
-  void OnAsyncRevalidationComplete(AsyncRevalidationMap::iterator it);
-
-  // Map of AsyncRevalidationDriver instances that are currently in-flight:
-  // either waiting to be scheduled or active on the network.
-  AsyncRevalidationMap in_progress_;
-
-  DISALLOW_COPY_AND_ASSIGN(AsyncRevalidationManager);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_LOADER_ASYNC_REVALIDATION_MANAGER_H_