Bug 40002: Remove about:ion

Firefox Ion (previously Firefox Pioneer) is an opt-in program in which people
volunteer to participate in studies that collect detailed, sensitive data about
how they use their browser.

browser/components/about/AboutRedirector.cpp

@@ -138,9 +138,6 @@ static const RedirEntry kRedirMap[] = {
          nsIAboutModule::URI_MUST_LOAD_IN_CHILD | nsIAboutModule::ALLOW_SCRIPT |
          nsIAboutModule::URI_CAN_LOAD_IN_PRIVILEGEDABOUT_PROCESS |
          nsIAboutModule::IS_SECURE_CHROME_UI},
-    {"ion", "chrome://browser/content/ion.html",
-     nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::HIDE_FROM_ABOUTABOUT |
-         nsIAboutModule::IS_SECURE_CHROME_UI},
 };
 
 static nsAutoCString GetAboutModuleName(nsIURI* aURI) {

browser/components/about/components.conf

@@ -14,7 +14,6 @@ pages = [
     'loginsimportreport',
     'firefoxview',
     'newtab',
-    'ion',
     'pocket-home',
     'pocket-saved',
     'pocket-signup',

browser/components/moz.build

@@ -40,7 +40,6 @@ DIRS += [
     "migration",
     "newtab",
     "originattributes",
-    "ion",
     "places",
     "pocket",
     "preferences",