Check that after a weak callback, the handle is either dead or strong

BUG=346061
R=dcarney@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/177943002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19534 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/global-handles.cc

@@ -271,7 +271,7 @@ class GlobalHandles::Node {
     }
     // Absence of explicit cleanup or revival of weak handle
     // in most of the cases would lead to memory leak.
-    ASSERT(state() != NEAR_DEATH);
+    CHECK(state() != NEAR_DEATH);
     return true;
   }