[tracing] Sanitize process memory dumps for background mode

gin/v8_isolate_memory_dump_provider_unittest.cc

Index: gin/v8_isolate_memory_dump_provider_unittest.cc
diff --git a/gin/v8_isolate_memory_dump_provider_unittest.cc b/gin/v8_isolate_memory_dump_provider_unittest.cc
index a1b730ac884d60eb9fcd6249d7114a6203a2d161..b04380a68048314037ca79745f594a1ebd180d3a 100644
--- a/gin/v8_isolate_memory_dump_provider_unittest.cc
+++ b/gin/v8_isolate_memory_dump_provider_unittest.cc
@@ -23,10 +23,10 @@ TEST_F(V8MemoryDumpProviderTest, DumpStatistics) {
   v8::V8::SetFlagsFromString(track_objects_flag,
                              static_cast<int>(strlen(track_objects_flag)));
 
-  std::unique_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
-      new base::trace_event::ProcessMemoryDump(nullptr));
   base::trace_event::MemoryDumpArgs dump_args = {
       base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
+  std::unique_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
+      new base::trace_event::ProcessMemoryDump(nullptr, dump_args));
   instance_->isolate_memory_dump_provider_for_testing()->OnMemoryDump(
       dump_args, process_memory_dump.get());
   const base::trace_event::ProcessMemoryDump::AllocatorDumpsMap&