Update browser_dbg_chrome-create.js according to the recent BrowserToolboxProcess refactoring (bug 918507). r=me

--HG--
extra : rebase_source : abb15c381e68687c80908b7a3393a5639f6ab704

browser/devtools/debugger/test/head.js

@@ -689,7 +689,7 @@ function initChromeDebugger(aOnClose) {
   let deferred = promise.defer();
 
   // Wait for the toolbox process to start...
-  BrowserToolboxProcess.init(aOnClose, aProcess => {
+  BrowserToolboxProcess.init(aOnClose, (aEvent, aProcess) => {
     info("Browser toolbox process started successfully.");
 
     prepareDebugger(aProcess);