Bug 1084955 - Remove redeclaration of Cu. r=fabrice

The Cu const is already defined by settings.js when adb.js is included
by shell.html. We should not redefine it.

--HG--
extra : rebase_source : 1063bfb6eea004fbc68655360dc1684ddfb91c71

b2g/chrome/content/devtools/adb.js

@@ -8,8 +8,6 @@
 
 // This file is only loaded on Gonk to manage ADB state
 
-const { utils: Cu } = Components;
-
 const DEBUG = false;
 var debug = function(str) {
   dump("AdbController: " + str + "\n");