Update from https://crrev.com/317530

base/memory/singleton.h

Index: base/memory/singleton.h
diff --git a/base/memory/singleton.h b/base/memory/singleton.h
index e5e2e3efed08527f0172d9b6b85866eaf8a37ea2..e50bdc05f34eeecefc293529e7eeab0e9da0bbde 100644
--- a/base/memory/singleton.h
+++ b/base/memory/singleton.h
@@ -23,7 +23,6 @@
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/memory/aligned_memory.h"
-#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
@@ -237,8 +236,6 @@ class Singleton {
     // instance_ pointer must acquire visibility over the singleton data.
     base::subtle::AtomicWord value = base::subtle::Acquire_Load(&instance_);
     if (value != 0 && value != base::internal::kBeingCreatedMarker) {
-      // See the corresponding HAPPENS_BEFORE below.
-      ANNOTATE_HAPPENS_AFTER(&instance_);
       return reinterpret_cast<Type*>(value);
     }
 
@@ -250,10 +247,6 @@ class Singleton {
       // stop right after we do this store.
       Type* newval = Traits::New();
 
-      // This annotation helps race detectors recognize correct lock-less
-      // synchronization between different threads calling get().
-      // See the corresponding HAPPENS_AFTER below and above.
-      ANNOTATE_HAPPENS_BEFORE(&instance_);
       // Releases the visibility over instance_ to the readers.
       base::subtle::Release_Store(
           &instance_, reinterpret_cast<base::subtle::AtomicWord>(newval));
@@ -267,8 +260,6 @@ class Singleton {
     // We hit a race. Wait for the other thread to complete it.
     value = base::internal::WaitForInstance(&instance_);
 
-    // See the corresponding HAPPENS_BEFORE above.
-    ANNOTATE_HAPPENS_AFTER(&instance_);
     return reinterpret_cast<Type*>(value);
   }