Mark JSArrayBuffer::SetupAllocatingData with WARN_UNUSED_RESULT.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 10820 matching lines @@
 
   DECLARE_CAST(JSArrayBuffer)
 
   void Neuter();
 
   V8_EXPORT_PRIVATE static void Setup(
       Handle<JSArrayBuffer> array_buffer, Isolate* isolate, bool is_external,
       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)
   DECLARE_VERIFIER(JSArrayBuffer)
 
   static const int kByteLengthOffset = JSObject::kHeaderSize;
   static const int kBackingStoreOffset = kByteLengthOffset + kPointerSize;
   static const int kBitFieldSlot = kBackingStoreOffset + kPointerSize;
 #if V8_TARGET_LITTLE_ENDIAN || !V8_HOST_ARCH_64_BIT
   static const int kBitFieldOffset = kBitFieldSlot;
@@ skipping 832 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_