Run jshint over all JavaScript files

ports/gdb/background.js

 /*
  * Copyright (c) 2013 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 'use strict';
 
 // The background page of the gdb chrome packaged app exists solely to
 // manage the set of operations that can only be performed in a v2 chrome app,
@@ skipping 343 matching lines @@
 
   var argv = [
       '-ex', 'target remote :' + self.debugTcpPort_,
   ];
   argv = ['gdb.nmf'].concat(argv);
 
   var argn = 0;
   argv.forEach(function(arg) {
     var argname = 'arg' + argn;
     addParam(argname, arg);
-    argn = argn + 1
+    argn = argn + 1;
   });
 
   document.body.appendChild(gdb);
   // Work around crbug.com/350445
   var junk = gdb.offsetTop;
 };
 
  /**
  * Suspend with javascript, then attach a GDB instance.
  */
@@ skipping 61 matching lines @@
   if (navigator.userAgent.indexOf('ChromeTestAgent/') < 0) {
     // TODO(bradnelson): Enable this check once a production extension id is
     // known for the debugger extension.
     //if (port.sender.id !== 'blessed-id') {
     //  port.disconnect();
     //  return;
     //}
   }
   var dc = new DebugConnection_(port);
 });