Remove Battery Status API support code from Blink

LayoutTests/batterystatus/script-tests/multiple-frames.js

-description('Tests using BatteryStatus from multiple frames.');
-
-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");
-}
-
-function checkChildBatteryStatus() {
-    shouldBe("battery.charging", "false");
-    shouldBe("battery.chargingTime", "Infinity");
-    shouldBe("battery.dischargingTime", "6000");
-    shouldBe("battery.level", "0.7");
-}
-
-var hasMainFrameEventFired = false;
-function mainFrameListener() {
-    hasMainFrameEventFired = true;
-    maybeFinishTest();
-}
-
-var hasChildFrameEventFired = false;
-function childFrameListener() {
-    hasChildFrameEventFired = true;
-    maybeFinishTest();
-}
-
-function maybeFinishTest() {
-    if (hasMainFrameEventFired && hasChildFrameEventFired) {
-        checkBatteryStatus();
-        checkChildBatteryStatus();
-        finishJSTest();
-    }
-}
-
-var childFrame = document.createElement('iframe');
-document.body.appendChild(childFrame);
-var childBattery = childFrame.contentWindow.navigator.webkitBattery
-childBattery.addEventListener('chargingchange', childFrameListener);
-battery.addEventListener('chargingchange', mainFrameListener);
-
-internals.setBatteryStatus(document, 'chargingchange', charging, chargingTime, dischargingTime, level);
-window.jsTestIsAsync = true;