Remove browser checks and use MediaWiki browser policy

We had a browser check to blacklist all browsers older than IE 8
IE <= 7

But that is no longer required since JS support is not there for such
browsers as per https://www.mediawiki.org/wiki/Compatibility#Modern
We can support all modern browsers listed there and we don't need
additional blacklisting now. From 1.27 onwards, there is no JS loaded
for IE 8 too. So we can just use MW browser support policy.

In this commit, the code to do brower checks removed and simplified
the initialization code. Still I am not happy with the interface module,
that need further refactoring.

Change-Id: I655826c55fb2c7c5c88f16368110142d64a96eec

resources/js/ext.uls.init.js

@@ -183,40 +183,4 @@
 		return unique;
 	};
 
-	/**
-	 * Checks whether the browser is supported.
-	 * Browser support policy: http://www.mediawiki.org/wiki/Browser_support#Grade_A
-	 *
-	 * @return {boolean}
-	 */
-	function isBrowserSupported() {
-		var blacklist = {
-			msie: [
-				[ '<=', 7 ]
-			]
-		};
-
-		return !$.client.test( blacklist, null, true );
-	}
-
-	/**
-	 * Initialize ULS front-end if browser is supported.
-	 *
-	 * @param {Function} callback callback function to be called after initialization.
-	 */
-	mw.uls.init = function ( callback ) {
-		if ( !isBrowserSupported() ) {
-			$( '#pt-uls' ).hide();
-
-			return;
-		}
-
-		if ( callback ) {
-			callback.call( this );
-		}
-	};
-
-	$( document ).ready( function () {
-		mw.uls.init();
-	} );
 }( jQuery, mediaWiki ) );