[tracing] Sanitize process memory dumps for background mode

base/trace_event/memory_dump_provider.h

Index: base/trace_event/memory_dump_provider.h
diff --git a/base/trace_event/memory_dump_provider.h b/base/trace_event/memory_dump_provider.h
index 79ab7934866a5bce8b7a26cf95fb962325b0920d..c899ea9c3464f9bda11c4f2918425227f2c312d6 100644
--- a/base/trace_event/memory_dump_provider.h
+++ b/base/trace_event/memory_dump_provider.h
@@ -15,12 +15,6 @@ namespace trace_event {
 
 class ProcessMemoryDump;
 
-// Args passed to OnMemoryDump(). This is to avoid rewriting all the subclasses
-// in the codebase when extending the MemoryDumpProvider API.
-struct MemoryDumpArgs {
-  MemoryDumpLevelOfDetail level_of_detail;
-};
-
 // The contract interface that memory dump providers must implement.
 class BASE_EXPORT MemoryDumpProvider {
  public: