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

net/base/sdch_manager.cc

Index: net/base/sdch_manager.cc
diff --git a/net/base/sdch_manager.cc b/net/base/sdch_manager.cc
index d577db8436c1c682fdcc0595febc39a360dd3167..038aada1df7cd84e2e29ed9a7b45a55d56bb8e1d 100644
--- a/net/base/sdch_manager.cc
+++ b/net/base/sdch_manager.cc
@@ -350,11 +350,15 @@ void SdchManager::DumpMemoryStats(
                     base::trace_event::MemoryAllocatorDump::kUnitsObjects,
                     total_count);
   }
+
   // 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(parent_dump_absolute_name + "/sdch_manager");
-  pmd->AddOwnershipEdge(empty_row_dump->guid(), dump->guid());
+  // if |this| is shared between URLRequestContexts. It is not required if
+  // parent details are not reported.
+  if (!parent_dump_absolute_name.empty()) {
+    base::trace_event::MemoryAllocatorDump* empty_row_dump =
+        pmd->CreateAllocatorDump(parent_dump_absolute_name + "/sdch_manager");
+    pmd->AddOwnershipEdge(empty_row_dump->guid(), dump->guid());
+  }
 }
 
 SdchProblemCode SdchManager::AddSdchDictionary(