[Isolates] Make lint happy.

src/spaces-inl.h

Index: src/spaces-inl.h
diff --git a/src/spaces-inl.h b/src/spaces-inl.h
index eea5315bdc9e70ab839ab8f7882cec9edd4ad90a..f994621d342fb419c50096106bd1f3e082ac7767 100644
--- a/src/spaces-inl.h
+++ b/src/spaces-inl.h
@@ -238,7 +238,8 @@ void Page::InvalidateWatermark(bool value) {
   } else {
     flags_ =
         (flags_ & ~(1 << WATERMARK_INVALIDATED)) |
-        (heap_->page_watermark_invalidated_mark_ ^ (1 << WATERMARK_INVALIDATED));
+        (heap_->page_watermark_invalidated_mark_ ^
+         (1 << WATERMARK_INVALIDATED));
   }
 
   ASSERT(IsWatermarkValid() == !value);