Remove Battery Status API support code from Blink

LayoutTests/batterystatus/script-tests/basic-all-types-of-events.js

-description('Tests the basic operation of all BatteryStatus events.');
-
-var charging = false;
-var chargingTime = Number.POSITIVE_INFINITY;
-var dischargingTime = 6000;
-var level = 0.7;
-
-var battery = navigator.webkitBattery;
-
-function checkBatteryStatus() {
-    shouldBe("battery.charging", "false");
-    shouldBe("battery.chargingTime", "Infinity");
-    shouldBe("battery.dischargingTime", "6000");
-    shouldBe("battery.level", "0.7");
-}
-
-battery.addEventListener('chargingchange', function() {
-    debug('chargingchange event is raised');
-    checkBatteryStatus();
-});
-
-battery.addEventListener('chargingtimechange', function() {
-    debug('chargingtimechange event is raised');
-    checkBatteryStatus();
-});
-
-battery.addEventListener('dischargingtimechange', function() {
-    debug('dischargingtimechange event is raised');
-    checkBatteryStatus();
-});
-
-battery.addEventListener('levelchange', function() {
-    debug('levelchange event is raised');
-    checkBatteryStatus();
-    finishJSTest();
-});
-
-internals.setBatteryStatus(document, 'chargingchange', charging, chargingTime, dischargingTime, level);
-internals.setBatteryStatus(document, 'chargingtimechange', charging, chargingTime, dischargingTime, level);
-internals.setBatteryStatus(document, 'dischargingtimechange', charging, chargingTime, dischargingTime, level);
-internals.setBatteryStatus(document, 'levelchange', charging, chargingTime, dischargingTime, level);
-window.jsTestIsAsync = true;