Fix test failures on nosnap builder.

src/snapshot-common.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 68 matching lines @@
   deserializer->set_reservation(MAP_SPACE, map_space_used_);
   deserializer->set_reservation(CELL_SPACE, cell_space_used_);
 }
 
 
 bool Snapshot::Initialize(const char* snapshot_file) {
   if (snapshot_file) {
     int len;
     byte* str = ReadBytes(snapshot_file, &len);
     if (!str) return false;
-    SnapshotByteSource source(str, len);
-    Deserializer deserializer(&source);
-    ReserveSpaceForSnapshot(&deserializer, snapshot_file);
-    bool success = V8::Initialize(&deserializer);
+    bool success;
+    {
+      SnapshotByteSource source(str, len);
+      Deserializer deserializer(&source);
+      ReserveSpaceForSnapshot(&deserializer, snapshot_file);
+      success = V8::Initialize(&deserializer);
+    }
     DeleteArray(str);
     return success;
   } else if (size_ > 0) {
     SnapshotByteSource source(raw_data_, raw_size_);
     Deserializer deserializer(&source);
     ReserveSpaceForLinkedInSnapshot(&deserializer);
     return V8::Initialize(&deserializer);
   }
   return false;
 }
@@ skipping 17 matching lines @@
   deserializer.set_reservation(OLD_DATA_SPACE, context_data_space_used_);
   deserializer.set_reservation(CODE_SPACE, context_code_space_used_);
   deserializer.set_reservation(MAP_SPACE, context_map_space_used_);
   deserializer.set_reservation(CELL_SPACE, context_cell_space_used_);
   deserializer.DeserializePartial(&root);
   CHECK(root->IsContext());
   return Handle<Context>(Context::cast(root));
 }
 
 } }  // namespace v8::internal