Bug 1837668 - Remove unused toolkit.browser.* prefs r=geckoview-reviewers,owlish

Differential Revision: https://phabricator.services.mozilla.com/D180459

mobile/android/app/mobile.js

@@ -12,25 +12,6 @@
 // improves readability, particular for conditional blocks that exceed a single
 // screen.
 
-// For browser.js element
-//
-// cacheRatio* is a ratio that determines the amount of pixels to cache. The
-// ratio is multiplied by the viewport width or height to get the displayport's
-// width or height, respectively.
-//
-// (divide integer value by 1000 to get the ratio)
-//
-// For instance: cachePercentageWidth is 1500
-//               viewport height is 500
-//               => display port height will be 500 * 1.5 = 750
-//
-pref("toolkit.browser.cacheRatioWidth", 2000);
-pref("toolkit.browser.cacheRatioHeight", 3000);
-
-// How long before a content view (a handle to a remote scrollable object)
-// expires.
-pref("toolkit.browser.contentViewExpire", 3000);
-
 pref("toolkit.defaultChromeURI", "chrome://geckoview/content/geckoview.xhtml");
 
 // If a tab has not been active for this long (seconds), then it may be