Use weak_ptr in bind call to TraceLog::OnFlushTimeout

base/debug/trace_event_impl.h

Index: base/debug/trace_event_impl.h
diff --git a/base/debug/trace_event_impl.h b/base/debug/trace_event_impl.h
index f91554112257b0808186d77b6abb47cbb2a381b8..e791793e8e45591d4cd70e3b9af997a6392c085b 100644
--- a/base/debug/trace_event_impl.h
+++ b/base/debug/trace_event_impl.h
@@ -17,6 +17,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_vector.h"
+#include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string_util.h"
 #include "base/synchronization/condition_variable.h"
@@ -812,6 +813,8 @@ class BASE_EXPORT TraceLog {
   scoped_refptr<MessageLoopProxy> flush_message_loop_proxy_;
   subtle::AtomicWord generation_;
 
+  base::WeakPtrFactory<TraceLog> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
 };