Revert of HttpCache::Transaction layer allowing parallel validation

net/url_request/url_request_unittest.cc

Index: net/url_request/url_request_unittest.cc
diff --git a/net/url_request/url_request_unittest.cc b/net/url_request/url_request_unittest.cc
index 341f8700461343441e62fb95b24b4a20b0bd366d..7282a0e54070ce6c5c9e8ca5468d0b0cc56167d7 100644
--- a/net/url_request/url_request_unittest.cc
+++ b/net/url_request/url_request_unittest.cc
@@ -4138,13 +4138,13 @@
         context.CreateRequest(url, DEFAULT_PRIORITY, &d));
     r->Start();
 
-    base::RunLoop().Run();
-
     {
       HttpRequestHeaders headers;
       EXPECT_TRUE(r->GetFullRequestHeaders(&headers));
-      EXPECT_TRUE(headers.HasHeader("Authorization"));
+      EXPECT_FALSE(headers.HasHeader("Authorization"));
     }
+
+    base::RunLoop().Run();
 
     EXPECT_EQ(OK, d.request_status());
     EXPECT_EQ(200, r->GetResponseCode());