Bug 1485676 - Convert TargetFactory.forTab call to forRemoteTab in debugger mochitest. r=yulia

Summary:
We are not passing a tab here. It only works by chance!

Depends On D4535

Reviewers: yulia!

Tags: #secure-revision

Bug #: 1485676

Differential Revision: https://phabricator.services.mozilla.com/D4536

MozReview-Commit-ID: K0ztxPM2N6A

devtools/client/debugger/test/mochitest/head.js

@@ -639,7 +639,7 @@ AddonDebugger.prototype = {
       customIframe: this.frame
     };
 
-    this.target = TargetFactory.forTab(targetOptions);
+    this.target = yield TargetFactory.forRemoteTab(targetOptions);
     let toolbox = yield gDevTools.showToolbox(this.target, "jsdebugger", Toolbox.HostType.CUSTOM, toolboxOptions);
 
     info("Addon debugger panel shown successfully.");