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.

Bug 41662: Disable about:sync-logs

Even though we disable sync by default with
`identity.fxaccounts.enabled`, this about: page is still avilable.
We could throw an exception on the constructor of the related
component, but it would result only in an error in the console, without
a visible "this address does not look right" error page.
If we fix the issues with MOZ_SERVICES_SYNC, we can restore the
component.

browser/components/BrowserGlue.jsm

@@ -2347,8 +2347,6 @@ BrowserGlue.prototype = {
     this._monitorScreenshotsPref();
     this._monitorWebcompatReporterPref();
     this._monitorHTTPSOnlyPref();
-    this._monitorIonPref();
-    this._monitorIonStudies();
     this._setupSearchDetection();
 
     this._monitorGPCPref();

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",

services/sync/components.conf

@@ -11,10 +11,4 @@ Classes = [
         'jsm': 'resource://services-sync/Weave.jsm',
         'constructor': 'WeaveService',
     },
-    {
-        'cid': '{d28f8a0b-95da-48f4-b712-caf37097be41}',
-        'contract_ids': ['@mozilla.org/network/protocol/about;1?what=sync-log'],
-        'jsm': 'resource://services-sync/Weave.jsm',
-        'constructor': 'AboutWeaveLog',
-    },
 ]