Expose an API to retrieve devtools' WebExtensionInspectedWindowFront which is needed
for webextensions. Exposed a new API on devtools/DevToolsShim
MozReview-Commit-ID: Dyc2UUJGsrs
Expose an API to retrieve devtools' WebExtensionInspectedWindowFront which is needed
for webextensions. Exposed a new API on devtools/DevToolsShim
MozReview-Commit-ID: Dyc2UUJGsrs
Also removes some dead code.
A lot of the code in ExtensionUtils.jsm is not needed in all processes, and a
lot of the rest isn't needed until extension code runs. Most of it winds up
being loaded into all processes way earlier than necessary.
MozReview-Commit-ID: CMRjCPOjRF2
