Bug 1544834 - Replace non-test uses of deprecated Array generics r=evilpie,dao

- `Array.forEach` becomes for-of loop or `array.forEach`.
- `Array.slice(a)` or `Array.slice(a, 0)` becomes `Array.from(a)`.
- `Array.map` becomes `Array.from`
- `Array` copy + concatenation becomes Array literal + spread syntax.
- All other `Array.X(a, ...)` become `Array.prototype.X.call` or `Array.from(a).X(...)`

Differential Revision: https://phabricator.services.mozilla.com/D27802

browser/base/content/browser-ctrlTab.js

@@ -289,7 +289,8 @@ var ctrlTab = {
   },
 
   advanceFocus: function ctrlTab_advanceFocus(aForward) {
-    let selectedIndex = Array.indexOf(this.previews, this.selected);
+    let selectedIndex = Array.prototype.indexOf.call(this.previews,
+      this.selected);
     do {
       selectedIndex += aForward ? 1 : -1;
       if (selectedIndex < 0)
@@ -565,7 +566,7 @@ var ctrlTab = {
 
   _initRecentlyUsedTabs() {
     this._recentlyUsedTabs =
-      Array.filter(gBrowser.tabs, tab => !tab.closing)
+      Array.prototype.filter.call(gBrowser.tabs, tab => !tab.closing)
            .sort((tab1, tab2) => tab2.lastAccessed - tab1.lastAccessed);
   },