Add support for jslint and cleanup core 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,
 // namely those requiring sockets access.
 //
 // runGdb - Create a nacl module for gdb and marshall its messages.
 // rspContinue - Allow a nacl module to run, waiting for it to exit or fault.
 // rspDetach - Allow a nacl module to run without monitoring it.
 // rspKill - Kill a nacl module by way of its debug port.
 
 
 /**
  * Compute the checksum of a remote stub command.
  * @param {string} cmd Command to checksum.
  * @return {string} Two digit hex checksum of command.
  */
 function rspChecksum_(cmd) {
   var checksum = 0;
-  for (var i = 0; i < cmd.length; i++) {
+  var i;
+  for (i = 0; i < cmd.length; i++) {
     checksum = (checksum + cmd.charCodeAt(i)) & 0xff;
   }
   var checksumStr = '0' + checksum.toString(16);
   checksumStr = checksumStr.substr(checksumStr.length - 2);
   return checksumStr;
 }
 
 /**
  * Convert a string to an ArrayBuffer.
  * @param {string} str.
  * @return {ArrayBuffer}.
  */
 function stringToArrayBuffer_(str) {
   var buf = new ArrayBuffer(str.length);
   var view = new Uint8Array(buf);
-  for (var i = 0; i < str.length; i++) {
+  var i;
+  for (i = 0; i < str.length; i++) {
     view[i] = str.charCodeAt(i);
   }
   return buf;
 }
 
 /**
  * Add markers and checksum to a remote stub command.
  * @param {string} cmd Command to checksum.
  * @return {string} A ready to send checksumed remote stub message string.
  */
@@ skipping 11 matching lines @@
 }
 
 /**
  * Decode a remote stub message.
  * @param {string} msg Message to decode.
  * @return {string} The decoded text.
  */
 function rspDecode_(msg) {
   var view = new Uint8Array(msg);
   var result = '';
-  for (var i = 0; i < msg.byteLength; i++) {
+  var i;
+  for (i = 0; i < msg.byteLength; i++) {
     result += String.fromCharCode(view[i]);
   }
   return result;
 }
 
 /**
  * Manage a single debug connection.
  * @private
  * @constructor
  */
@@ skipping 351 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);
 });