Revert "Do not reuse a loading resource associated with another fetcher"

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
     rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
@@ skipping 803 matching lines @@
 ResourceFetcher::RevalidationPolicy
 ResourceFetcher::DetermineRevalidationPolicy(Resource::Type type,
                                              const FetchRequest& fetch_request,
                                              Resource* existing_resource,
                                              bool is_static_data) const {
   const ResourceRequest& request = fetch_request.GetResourceRequest();
 
   if (!existing_resource)
     return kLoad;
 
-  // If the existing resource is loading and the associated fetcher is not equal
-  // to |this|, we must not use the resource. Otherwise, CSP violation may
-  // happen in redirect handling.
-  if (existing_resource->Loader() &&
-      existing_resource->Loader()->Fetcher() != this) {
-    return kReload;
-  }
-
   // Checks if the resource has an explicit policy about integrity metadata.
   //
   // This is necessary because ScriptResource and CSSStyleSheetResource objects
   // do not keep the raw data around after the source is accessed once, so if
   // the resource is accessed from the MemoryCache for a second time, there is
   // no way to redo an integrity check.
   //
   // Thus, Blink implements a scheme where it caches the integrity information
   // for those resources after the first time it is checked, and if there is
   // another request for that resource, with the same integrity metadata, Blink
@@ skipping 735 matching lines @@
   visitor->Trace(context_);
   visitor->Trace(archive_);
   visitor->Trace(loaders_);
   visitor->Trace(non_blocking_loaders_);
   visitor->Trace(document_resources_);
   visitor->Trace(preloads_);
   visitor->Trace(resource_timing_info_map_);
 }
 
 }  // namespace blink