Bug 1157987 - Remove unused browser.addon-watch.percentage-limit pref. r=dteller

modules/libpref/init/all.js

@@ -5276,8 +5276,6 @@ pref("browser.addon-watch.interval", 15000);
 pref("browser.addon-watch.interval", -1);
 #endif
 pref("browser.addon-watch.ignore", "[\"mochikit@mozilla.org\",\"special-powers@mozilla.org\",\"fxdevtools-adapters@mozilla.org\",\"fx-devtools\"]");
-// the percentage of time addons are allowed to use without being labeled slow
-pref("browser.addon-watch.percentage-limit", 5);
 
 // Search service settings
 pref("browser.search.log", false);