Update sqlite to 3.7.3.

third_party/sqlite/src/test/attachmalloc.test

Index: third_party/sqlite/src/test/attachmalloc.test
diff --git a/third_party/sqlite/src/test/attachmalloc.test b/third_party/sqlite/src/test/attachmalloc.test
index 30841cea76f797dd7baace70c9c8aa3b4ba2844e..cc506bee6abbaaa24efb094cb2e4fe1b68daeac8 100644
--- a/third_party/sqlite/src/test/attachmalloc.test
+++ b/third_party/sqlite/src/test/attachmalloc.test
@@ -60,4 +60,17 @@ do_malloc_test attachmalloc-2 -tclprep {
   ATTACH 'test2.db' AS db1;
 }
 
+set enable_shared_cache [sqlite3_enable_shared_cache 1]
+sqlite3 dbaux test2.db
+dbaux eval {SELECT * FROM sqlite_master}
+do_malloc_test attachmalloc-3 -sqlbody {
+  SELECT * FROM sqlite_master;
+  ATTACH 'test2.db' AS two;
+} -cleanup {
+  db eval { DETACH two }
+}
+dbaux close
+sqlite3_enable_shared_cache $enable_shared_cache
+
+
 finish_test