Set ArrayBufferContents size to 0 on allocation failure

Source/wtf/ArrayBufferContents.cpp

Index: Source/wtf/ArrayBufferContents.cpp
diff --git a/Source/wtf/ArrayBufferContents.cpp b/Source/wtf/ArrayBufferContents.cpp
index 2e08a1afa2c2f6e337b176ed37afed8f71f4bfa7..1ac56fe8dedd38a4faaff4b28ff6ae301a2f54dc 100644
--- a/Source/wtf/ArrayBufferContents.cpp
+++ b/Source/wtf/ArrayBufferContents.cpp
@@ -134,7 +134,7 @@ void ArrayBufferContents::DataHolder::allocateNew(unsigned sizeInBytes, SharingT
     void* data = nullptr;
     allocateMemory(sizeInBytes, policy, data);
     m_data = data;
-    m_sizeInBytes = sizeInBytes;
+    m_sizeInBytes = data ? sizeInBytes : 0;
     m_isShared = isShared;
 }