#14 issue with idekey

removed (implied) globals, fixed idekey undefined issue for chrome v23. I'm running forked version without issues:

The variable idekey is undefined in chrome (v23) under win7:

console.error("Error in event handler for '" + this.eventName_ +
Error in event handler for 'undefined': idekey is not defined ReferenceError: idekey is not defined
at xdebugCheckStatus (chrome-extension://[...]/content.js:25:43)
at chrome-extension://[...]/content.js:12:14
at chrome.Event.dispatchToListener (event_bindings:387:21)
at chrome.Event.dispatch_ (event_bindings:373:27)
at chrome.Event.dispatch (event_bindings:393:17)
at miscellaneous_bindings:163:26
at chrome.Event.dispatchToListener (event_bindings:387:21)
at chrome.Event.dispatch_ (event_bindings:373:27)
at chrome.Event.dispatch (event_bindings:393:17)
at Object.chromeHidden.Port.dispatchOnMessage (miscellaneous_bindings:253:22)