[tests] Cleanup tests that use assertOptimized()/assertUnoptimized().

test/inspector/debugger/pause-on-oom.js

Index: test/inspector/debugger/pause-on-oom.js
diff --git a/test/inspector/debugger/pause-on-oom.js b/test/inspector/debugger/pause-on-oom.js
index 5670354bf274de636ff74b8de1b27c18891287d5..84995dbf3969bf9dfb9723274c1f18305155831b 100644
--- a/test/inspector/debugger/pause-on-oom.js
+++ b/test/inspector/debugger/pause-on-oom.js
@@ -1,7 +1,8 @@
 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// Flags: --max_old_space_size=4
+
+// Flags: --max-old-space-size=4
 
 print('Check pause on OOM');