Update implementation of atomics with latest Chromium version but use compiler builtin atomics

src/base/atomicops_internals_atomicword_compat.h

Index: src/base/atomicops_internals_atomicword_compat.h
diff --git a/src/base/atomicops_internals_atomicword_compat.h b/src/base/atomicops_internals_atomicword_compat.h
index 4f758a72990acc22220431ef63a01c547ee48352..5071f442b4d3c0e6470dbe848c845ce195280dcb 100644
--- a/src/base/atomicops_internals_atomicword_compat.h
+++ b/src/base/atomicops_internals_atomicword_compat.h
@@ -67,11 +67,6 @@ inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
       reinterpret_cast<volatile Atomic32*>(ptr), value);
 }
 
-inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
-  return v8::base::Acquire_Store(
-      reinterpret_cast<volatile Atomic32*>(ptr), value);
-}
-
 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
   return v8::base::Release_Store(
       reinterpret_cast<volatile Atomic32*>(ptr), value);
@@ -87,11 +82,6 @@ inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
       reinterpret_cast<volatile const Atomic32*>(ptr));
 }
 
-inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
-  return v8::base::Release_Load(
-      reinterpret_cast<volatile const Atomic32*>(ptr));
-}
-
 }  // namespace base
 }  // namespace v8