Currently, when we create an error object at the end of an aysnc operation, we
only get a useful caller location if async stacks are enabled.
This patch changes our behavior to use the saved caller location we've already
stored when creating an Error object based on a plain string message.
MozReview-Commit-ID: DDO0lAUHYRO
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 {, <
