Mark JSArrayBuffer::SetupAllocatingData with WARN_UNUSED_RESULT.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9301387c76102a9ee87b5aed821278f12efa583b..4c1a5acb85d55af2c7b2d46bdd43cbe80e9085cf 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10838,10 +10838,12 @@ class JSArrayBuffer: public JSObject {
       void* data, size_t allocated_length,
       SharedFlag shared = SharedFlag::kNotShared);
 
-  static bool SetupAllocatingData(Handle<JSArrayBuffer> array_buffer,
-                                  Isolate* isolate, size_t allocated_length,
-                                  bool initialize = true,
-                                  SharedFlag shared = SharedFlag::kNotShared);
+  // Returns false if array buffer contents could not be allocated.
+  // In this case, |array_buffer| will not be set up.
+  static bool SetupAllocatingData(
+      Handle<JSArrayBuffer> array_buffer, Isolate* isolate,
+      size_t allocated_length, bool initialize = true,
+      SharedFlag shared = SharedFlag::kNotShared) WARN_UNUSED_RESULT;
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSArrayBuffer)