Bug 1577449 - Replace Learn about Send Tab link. r=markh

Differential Revision: https://phabricator.services.mozilla.com/D46631

--HG--
extra : moz-landing-system : lando

browser/app/profile/firefox.js

@@ -982,9 +982,6 @@ pref("app.support.baseURL", "https://support.mozilla.org/1/firefox/%VERSION%/%OS
   pref("app.feedback.baseURL", "https://input.mozilla.org/%LOCALE%/feedback/%APP%/%VERSION%/");
 #endif
 
-// base URL for web-based marketing pages
-pref("app.productInfo.baseURL", "https://www.mozilla.org/firefox/features/");
-
 // Name of alternate about: page for certificate errors (when undefined, defaults to about:neterror)
 pref("security.alternate_certificate_error_page", "certerror");
 
@@ -1457,6 +1454,9 @@ pref("identity.sync.tokenserver.uri", "https://token.services.mozilla.com/1.0/sy
 // of making changes to "identity.fxaccounts.*.uri".
 pref("identity.fxaccounts.autoconfig.uri", "");
 
+// URL for help link about Send Tab.
+pref("identity.sendtabpromo.url", "https://support.mozilla.org/1/firefox/%VERSION%/%OS%/%LOCALE%/send-tab");
+
 // URLs for promo links to mobile browsers. Note that consumers are expected to
 // append a value for utm_campaign.
 pref("identity.mobilepromo.android", "https://www.mozilla.org/firefox/android/?utm_source=firefox-browser&utm_medium=firefox-browser&utm_campaign=");

browser/base/content/browser-sync.js

@@ -115,11 +115,6 @@ var gSync = {
         }
       }
     );
-    XPCOMUtils.defineLazyPreferenceGetter(
-      this,
-      "PRODUCT_INFO_BASE_URL",
-      "app.productInfo.baseURL"
-    );
     XPCOMUtils.defineLazyPreferenceGetter(
       this,
       "FXA_ENABLED",
@@ -632,8 +627,9 @@ var gSync = {
   },
 
   openSendToDevicePromo() {
-    let url = this.PRODUCT_INFO_BASE_URL;
-    url += "send-tabs/?utm_source=" + Services.appinfo.name.toLowerCase();
+    const url = Services.urlFormatter.formatURLPref(
+      "identity.sendtabpromo.url"
+    );
     switchToTabHavingURI(url, true, { replaceQueryString: true });
   },