Revert "Deferred: add .catch handler"

This reverts commit ef77f83db8.

src/deferred.js

@@ -34,9 +34,6 @@ jQuery.extend( {
 					deferred.done( arguments ).fail( arguments );
 					return this;
 				},
-				"catch": function( fn ) {
-					return promise.then( null, fn );
-				},
 
 				// Keep pipe for back-compat
 				pipe: function( /* fnDone, fnFail, fnProgress */ ) {

test/unit/deferred.js

@@ -166,44 +166,7 @@ QUnit.test( "jQuery.Deferred.then - filtering (fail)", function( assert ) {
 	} );
 } );
 
-QUnit.test( "jQuery.Deferred.catch", function( assert ) {
-	assert.expect( 4 );
-
-	var value1, value2, value3,
-		defer = jQuery.Deferred(),
-		piped = defer[ "catch" ]( function( a, b ) {
-			return a * b;
-		} ),
-		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );
-
-	piped.done( function( result ) {
-		value3 = result;
-	} );
-
-	defer.fail( function( a, b ) {
-		value1 = a;
-		value2 = b;
-	} );
-
-	defer.reject( 2, 3 )[ "catch" ]( function() {
-		assert.strictEqual( value1, 2, "first reject value ok" );
-		assert.strictEqual( value2, 3, "second reject value ok" );
-		assert.strictEqual( value3, 6, "result of filter ok" );
-		done.pop().call();
-	} );
-
-	jQuery.Deferred().resolve()[ "catch" ]( function() {
-		assert.ok( false, "then should not be called on resolve" );
-	} ).then( done.pop() );
-
-	jQuery.Deferred().reject()[ "catch" ]( jQuery.noop ).done( function( value ) {
-		assert.strictEqual( value, undefined, "then fail callback can return undefined/null" );
-		done.pop().call();
-	} );
-} );
-
 QUnit.test( "[PIPE ONLY] jQuery.Deferred.pipe - filtering (fail)", function( assert ) {
-
 	assert.expect( 4 );
 
 	var value1, value2, value3,