Revert of Remove reference counting from HttpNetworkSession.

net/url_request/view_cache_helper_unittest.cc

Index: net/url_request/view_cache_helper_unittest.cc
diff --git a/net/url_request/view_cache_helper_unittest.cc b/net/url_request/view_cache_helper_unittest.cc
index e10b2034e5f9b6e95328f96647128a9a9e8023c0..284482ac98894c8a92cabbd6c66e625b0b9880dd 100644
--- a/net/url_request/view_cache_helper_unittest.cc
+++ b/net/url_request/view_cache_helper_unittest.cc
@@ -31,10 +31,8 @@
 };
 
 TestURLRequestContext::TestURLRequestContext()
-    : cache_(new MockNetworkLayer(),
-             nullptr,
-             HttpCache::DefaultBackend::InMemory(0),
-             true) {
+    : cache_(new MockNetworkLayer(), NULL,
+             HttpCache::DefaultBackend::InMemory(0)) {
   set_http_transaction_factory(&cache_);
 }