ExportChromePasswords.js

ExportChromePasswords.js

var decryptedRow="";
var pm = PasswordManager.getInstance();
var model = pm.savedPasswordsList_.dataModel;
var pl = pm.savedPasswordsList_;
for(i=0;i<model.length;i++){
  PasswordManager.requestShowPassword(i);
};
setTimeout(function(){
  decryptedRow += '"hostname","username","password","formSubmitURL","httpRealm","usernameField","passwordField"';
  for(i=0; i<model.length; i++){
    var item = pl.getListItemByIndex(i);
    decryptedRow += '<br/>"http://'+model.array_[i][0]+'","'+model.array_[i][1]+'","'+item.childNodes[0].childNodes[2].childNodes[0].value+'","http://'+model.array_[i][0]+'"," "," "," "';
  };
document.write(decryptedRow);
}
,300);

updated

var pm = PasswordManager.getInstance();
var pl = pm.savedPasswordsList_;
var model = pm.savedPasswordsList_.dataModel;

setTimeout(function(){
  var item, url, user, pass
  var decryptedRow = '"url","username","password"\n';
  for (i=0; i < model.length; i++) {
    PasswordManager.requestShowPassword(i);
    item = pl.getListItemByIndex(i).childNodes[0];
    url = item.childNodes[0].childNodes[0]
    user = item.childNodes[1].childNodes[0].value
    pass = item.childNodes[2].childNodes[0].value
    decryptedRow += url + ', ' + user + ', ' + pass + '\n'
  };
  console.log(decryptedRow);
}
,300);

Updated for Chrome 55 on MacOS 10.12.2. Tested on 403 passwords.
During processing you can see percent of processed passwords.
Small note: if you have many passwords, Chrome will ask password several times during export.

var pm = PasswordManager.getInstance();
var pl = pm.savedPasswordsList_;

function sleep(ms) {
  return new Promise((r) => { setTimeout(() => {r()}, ms) })
}


var model = pm.savedPasswordsList_.dataModel;
(async function() {
  await sleep(1000);
  var item, url, user, pass;
  
  pl.scrollTop = 0;
  var decryptedRow = '"url","username","password"\n';

  for (i=0; i < model.array_.length; i++) {
    var percent = ((i+1) / model.array_.length * 100).toFixed(2);
    console.log('Processing: ' + percent + '%');

    pass = null;
    await sleep(100);
    PasswordManager.requestShowPassword(i);
    await sleep(600);
    
    while (! pass || pass.trim().length == 0) { // while pass length == 0, Chrome showing password dialog
      try {
        item = pl.getListItemByIndex(i).childNodes[0];
      } catch (e) {
        await sleep(1000);
        try {
          item = pl.getListItemByIndex(i).childNodes[0];
        } catch (e2) {
          console.log('ERROR on index ' + i, pl.getListItemByIndex(i));
        }
      }
      url = item.childNodes[0].childNodes[0]
      user = item.childNodes[1].childNodes[0].value
      pass = item.childNodes[2].childNodes[0].value
      if (pass.trim().length == 0) {
        await sleep(1000);
      }
    }
    
    decryptedRow += url + ', ' + user + ', ' + pass + '\n'

    pl.scrollTop += 32;
  };

  console.log(decryptedRow);

})();

If you want to speed up the above script, just replace all sleep timer to 10. Tested on 840 rows of passwords, reducing waiting time does not change anything and speed up the process by almost 100x