Make the debugger completely unload when the debug event listener is unregist...

Make the debugger completely unload when the debug event listener is unregistered.

Added a number of handle scopes to the debugger code to keep handles local to the function using them.

Fixed SetDebugEventListener to actually unregister when passed a NULL pointer. Previously this NULL pointer was wrapped in a Proxy.

BUG=1242702
Committed: http://code.google.com/p/v8/source/detail?r=1269

[Mads Ager (chromium), 2009-02-13 12:31:15]

LGTM

http://codereview.chromium.org/21347/diff/1/6
File src/debug.cc (right):

http://codereview.chromium.org/21347/diff/1/6#newcode370
Line 370: // DebugInfo wvwn though the code is patched back to the non break
point state.
Keyboard off by one: wvwn -> even.  :-)

http://codereview.chromium.org/21347/diff/1/6#newcode605
Line 605: // Get rid of all break pointa and related information.
pointa -> points

[Søren Thygesen Gjesse, 2009-02-13 12:35:42]

http://codereview.chromium.org/21347/diff/1/6
File src/debug.cc (right):

http://codereview.chromium.org/21347/diff/1/6#newcode370
Line 370: // DebugInfo wvwn though the code is patched back to the non break
point state.
On 2009/02/13 12:31:15, Mads Ager wrote:
> Keyboard off by one: wvwn -> even.  :-)

Done.

http://codereview.chromium.org/21347/diff/1/6#newcode605
Line 605: // Get rid of all break pointa and related information.
On 2009/02/13 12:31:15, Mads Ager wrote:
> pointa -> points

Done.