Correctly initialize MemoryDumpArgs in the MojoHandleTable test.

mojo/edk/system/handle_table_unittest.cc

Index: mojo/edk/system/handle_table_unittest.cc
diff --git a/mojo/edk/system/handle_table_unittest.cc b/mojo/edk/system/handle_table_unittest.cc
index 15bace0144913235d95a2fb3276b7375f4c2b1e4..1e7234210f1f4664d339b5532204d09d7e471c0c 100644
--- a/mojo/edk/system/handle_table_unittest.cc
+++ b/mojo/edk/system/handle_table_unittest.cc
@@ -64,7 +64,8 @@ TEST(HandleTableTest, OnMemoryDump) {
     ht.AddDispatcher(dispatcher);
   }
 
-  base::trace_event::MemoryDumpArgs args;
+  base::trace_event::MemoryDumpArgs args = {
+      base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
   base::trace_event::ProcessMemoryDump pmd(nullptr, args);
   ht.OnMemoryDump(args, &pmd);