Move files in wtf/ to platform/wtf/ (Part 5).

third_party/WebKit/Source/wtf/Allocator.h

Index: third_party/WebKit/Source/wtf/Allocator.h
diff --git a/third_party/WebKit/Source/wtf/Allocator.h b/third_party/WebKit/Source/wtf/Allocator.h
index 5aacf776cee91fdc08040ce0a390330840d003ab..3bbe5334bc0578776603df626e630f123bb97532 100644
--- a/third_party/WebKit/Source/wtf/Allocator.h
+++ b/third_party/WebKit/Source/wtf/Allocator.h
@@ -6,7 +6,7 @@
 #define WTF_Allocator_h
 
 #include "wtf/Assertions.h"
-#include "wtf/StdLibExtras.h"
+#include "wtf/TypeTraits.h"
 #include "wtf/allocator/Partitions.h"
 
 namespace WTF {
@@ -146,4 +146,11 @@ namespace WTF {
 
 }  // namespace WTF
 
+// This version of placement new omits a 0 check.
+enum NotNullTag { NotNull };
+inline void* operator new(size_t, NotNullTag, void* location) {
+  DCHECK(location);
+  return location;
+}
+
 #endif /* WTF_Allocator_h */