Move atomic ops and related files to base library

src/unbound-queue.h

Index: src/unbound-queue.h
diff --git a/src/unbound-queue.h b/src/unbound-queue.h
index 6208fccad47b20aff7e7ca2c5d8b1c5243946c9c..3e129289739a39703cd7f7e70cf8f61059a17ae0 100644
--- a/src/unbound-queue.h
+++ b/src/unbound-queue.h
@@ -6,6 +6,7 @@
 #define V8_UNBOUND_QUEUE_
 
 #include "src/allocation.h"
+#include "src/base/atomicops.h"
 
 namespace v8 {
 namespace internal {
@@ -34,8 +35,8 @@ class UnboundQueue BASE_EMBEDDED {
   struct Node;
 
   Node* first_;
-  AtomicWord divider_;  // Node*
-  AtomicWord last_;     // Node*
+  base::AtomicWord divider_;  // Node*
+  base::AtomicWord last_;     // Node*
 
   DISALLOW_COPY_AND_ASSIGN(UnboundQueue);
 };