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

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

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
index e17a24a7547d7b7344346c6ae243950ca2102002..29a920e43746f598238a862babad527fe2244870 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
@@ -821,14 +821,6 @@ ResourceFetcher::DetermineRevalidationPolicy(Resource::Type type,
   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