[OBSOLETE][memory-infra] Whitelist net dump providers in field trials

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index c64755a707212620dda5f4963330f8dd9980bd27..6bbdc1b907c635b2407fc30dd12a9ee495c77eda 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -429,13 +429,17 @@ void HttpNetworkSession::DumpMemoryStats(
     spdy_session_pool_.DumpMemoryStats(
         pmd, http_network_session_dump->absolute_name());
   }
+
   // Create an empty row under parent's dump so size can be attributed correctly
-  // if |this| is shared between URLRequestContexts.
-  base::trace_event::MemoryAllocatorDump* empty_row_dump =
-      pmd->CreateAllocatorDump(base::StringPrintf(
-          "%s/http_network_session", parent_absolute_name.c_str()));
-  pmd->AddOwnershipEdge(empty_row_dump->guid(),
-                        http_network_session_dump->guid());
+  // if |this| is shared between URLRequestContexts. It is not required if
+  // parent details are not reported.
+  if (!parent_absolute_name.empty()) {
+    base::trace_event::MemoryAllocatorDump* empty_row_dump =
+        pmd->CreateAllocatorDump(base::StringPrintf(
+            "%s/http_network_session", parent_absolute_name.c_str()));
+    pmd->AddOwnershipEdge(empty_row_dump->guid(),
+                          http_network_session_dump->guid());
+  }
 }
 
 bool HttpNetworkSession::IsQuicEnabled() const {