[tracing] Add test for memory-infra startup tracing

base/trace_event/memory_dump_manager.h

Index: base/trace_event/memory_dump_manager.h
diff --git a/base/trace_event/memory_dump_manager.h b/base/trace_event/memory_dump_manager.h
index 1092a264830aa1dc1d3280d48aaaf707e4f46d24..4c4a8608b5791001156212f8ecb9b943024ec34e 100644
--- a/base/trace_event/memory_dump_manager.h
+++ b/base/trace_event/memory_dump_manager.h
@@ -105,11 +105,6 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
     return kSystemAllocatorPoolName;
   };
 
-  // Tells the initialization phase to skip scheduling periodic memory dumps.
-  void DisablePeriodicDumpsForTesting() {
-    disable_periodic_dumps_for_testing_ = true;
-  }
-
  private:
   friend struct DefaultDeleter<MemoryDumpManager>;  // For the testing instance.
   friend struct DefaultSingletonTraits<MemoryDumpManager>;
@@ -233,11 +228,6 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   // Skips the auto-registration of the core dumpers during Initialize().
   bool skip_core_dumpers_auto_registration_for_testing_;
 
-  // When true, the initialization phase does not start the periodic memory
-  // dumps.
-  // TODO(primiano): This should go into TraceConfig. https://goo.gl/5Hj3o0.
-  bool disable_periodic_dumps_for_testing_;
-
   DISALLOW_COPY_AND_ASSIGN(MemoryDumpManager);
 };