Bug 1640967 - Remove cpows preferences. r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D76871

browser/app/profile/firefox.js

@@ -1712,9 +1712,6 @@ pref("browser.tabs.crashReporting.email", "");
 // nightly and developer edition.
 pref("extensions.experiments.enabled", false);
 
-// Causes access on unsafe CPOWs from browser code to throw by default.
-pref("dom.ipc.cpows.forbid-unsafe-from-browser", true);
-
 #if defined(XP_WIN)
   // Allows us to deprioritize the processes of background tabs at an OS level
   pref("dom.ipc.processPriorityManager.enabled", true);

modules/libpref/init/StaticPrefList.yaml

@@ -1985,21 +1985,6 @@
 #endif
   mirror: always
 
-- name: dom.ipc.cpows.forbid-unsafe-from-browser
-  type: bool
-  value: false
-  mirror: always
-
-- name: dom.ipc.cpows.log.enabled
-  type: bool
-  value: false
-  mirror: always
-
-- name: dom.ipc.cpows.log.stack
-  type: bool
-  value: false
-  mirror: always
-
 # Whether a native event loop should be used in the content process.
 - name: dom.ipc.useNativeEventProcessing.content
   type: RelaxedAtomicBool