Fix the memcheck annotation in RecordDeath().

base/tracked_objects.cc

Index: base/tracked_objects.cc
diff --git a/base/tracked_objects.cc b/base/tracked_objects.cc
index 8bbd07e35845af830964aa85130dfb832a79a781..ffb083b319e053c154c19b107cf020740f43f5d0 100644
--- a/base/tracked_objects.cc
+++ b/base/tracked_objects.cc
@@ -220,7 +220,7 @@ ThreadData::~ThreadData() {}
 
 void ThreadData::PushToHeadOfList() {
   // Toss in a hint of randomness (atop the uniniitalized value).
-  (void)VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE(random_number_,
+  (void)VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE(&random_number_,
                                                  sizeof(random_number_));
   random_number_ += static_cast<int32>(this - static_cast<ThreadData*>(0));
   random_number_ ^= (Now() - TrackedTime()).InMilliseconds();