chakrashim: add dummy shim for v8::ArrayBuffer::Allocator::NewDefaultAllocator

Author: boingoing

deps/chakrashim/include/v8.h

@@ -1990,6 +1990,7 @@ class V8_EXPORT ArrayBuffer : public Object {
     virtual void* Allocate(size_t length) = 0;
     virtual void* AllocateUninitialized(size_t length) = 0;
     virtual void Free(void* data, size_t length) = 0;
+    static Allocator* NewDefaultAllocator();
   };
 
   class V8_EXPORT Contents {  // NOLINT

deps/chakrashim/src/v8arraybuffer.cc

@@ -46,6 +46,10 @@ struct ArrayBufferFinalizeInfo {
   }
 };
 
+v8::ArrayBuffer::Allocator* v8::ArrayBuffer::Allocator::NewDefaultAllocator() {
+    return nullptr;
+}
+
 static void CHAKRA_CALLBACK ExternalArrayBufferFinalizeCallback(void *data) {
     static_cast<ArrayBufferFinalizeInfo*>(data)->Free();
 }