Fixup 59e0f3f4: explicitly list our functions in self-destruct

Seems simpler and more robust. Otherwise Chrome spams console warnings about its webkit* aliases we touch.

apply.js

@@ -321,14 +321,24 @@ function initObserver() {
 		iframeObserver.disconnect();
 
 		// we can destroy global functions in this context to free up memory
-		var globals = Object.keys(window);
+		[
-		for (var i = 0, len = globals.length; i < len; i++) {
+			'addDocumentStylesToAllIFrames',
-			var key = globals[i];
+			'addDocumentStylesToIFrame',
-			var obj = window[key];
+			'addStyleElement',
-			if (typeof obj == 'function' && !/native code/.test(obj)) {
+			'addStyleToIFrameSrcDoc',
-				window[key] = null;
+			'applyOnMessage',
-			}
+			'applySections',
-		}
+			'applyStyles',
+			'disableAll',
+			'getDynamicIFrames',
+			'iframeIsDynamic',
+			'iframeIsLoadingSrcDoc',
+			'initObserver',
+			'removeStyle',
+			'replaceAll',
+			'requestStyles',
+			'retireStyle'
+		].forEach(fn => window[fn] = null);
 
 		// we can destroy global variables
 		g_styleElements = iframeObserver = retiredStyleIds = null;