Fix Unhandled ReferenceError in debug-debugger.js

Fix Unhandled ReferenceError in debug-debugger.js

This fixes following exception in Sky on attempt to set a breakpoint
"Unhandled: Uncaught ReferenceError: break_point is not defined"
I think this happens in Sky but not in Chrome because Sky scripts are executed in strict mode.

BUG=None
LOG=N
R=yangguo@chromium.org

Committed: https://chromium.googlesource.com/v8/v8/+/2ad2237507c5b5f9047b8d94d2f4997327eae852

[yurys, 2014-11-19 09:35:35]

yurys@chromium.org changed reviewers:
+ eseidel@chromium.org, yangguo@chromium.org

[Yang, 2014-11-19 09:43:44]

On 2014/11/19 09:35:35, yurys wrote:

lgtm.

I think it generally makes sense to have both mirror-debugger.js and
debug-debugger.js in strict mode by default.

[yurys, 2014-11-19 10:25:47]

Committed patchset #1 (id:1) manually as
2ad2237507c5b5f9047b8d94d2f4997327eae852 (presubmit successful).

[yurys, 2014-11-19 12:15:41]

On 2014/11/19 09:43:44, Yang wrote:
> On 2014/11/19 09:35:35, yurys wrote:
> 
> lgtm.
> 
> I think it generally makes sense to have both mirror-debugger.js and
> debug-debugger.js in strict mode by default.

Filed a bug on this:
https://code.google.com/p/v8/issues/detail?id=3708#makechanges