1. add a set new mochitests to test cleanup function.
By redirecting to another page.
By redirecting to another page, when PaymentRequest.show() is called.
By reloading
By removing/closing the page.
2. remove unnecessary PaymentRequestService.cleanup() call in the test suite.
This patch was autogenerated by my decomponents.py
It covers almost every file with the extension js, jsm, html, py,
xhtml, or xul.
It removes blank lines after removed lines, when the removed lines are
preceded by either blank lines or the start of a new block. The "start
of a new block" is defined fairly hackily: either the line starts with
//, ends with */, ends with {, <