Remove workarounds for the uglify task mishandling banners when used with source maps. (cherry-picked from d0fadbba9f)

The issue was fixed in grunt-contrib-uglify:
https://github.com/gruntjs/grunt-contrib-uglify/issues/22

Gruntfile.js

@@ -5,7 +5,7 @@ module.exports = function( grunt ) {
 		var data = {};
 		try {
 			data = grunt.file.readJSON( filepath );
-		} catch(e) {}
+		} catch ( e ) {}
 		return data;
 	}
 
@@ -17,8 +17,8 @@ module.exports = function( grunt ) {
 	delete srcHintOptions.onevar;
 
 	grunt.initConfig({
-		pkg: grunt.file.readJSON("package.json"),
-		dst: readOptionalJSON("dist/.destination.json"),
+		pkg: grunt.file.readJSON( "package.json" ),
+		dst: readOptionalJSON( "dist/.destination.json" ),
 		compare_size: {
 			files: [ "dist/jquery.js", "dist/jquery.min.js" ],
 			options: {
@@ -87,39 +87,28 @@ module.exports = function( grunt ) {
 			tasks: "build/tasks/*.js"
 		},
 		testswarm: {
-			tests: "ajax attributes callbacks core css data deferred dimensions effects event manipulation offset queue selector serialize support traversing Sizzle".split(" ")
+			tests: "ajax attributes callbacks core css data deferred dimensions effects event manipulation offset queue selector serialize support traversing Sizzle".split( " " )
 		},
 		watch: {
 			files: [ "<%= jshint.grunt.src %>", "<%= jshint.tests.src %>", "src/**/*.js" ],
 			tasks: "dev"
 		},
-		"pre-uglify": {
-			all: {
-				files: {
-					"dist/jquery.pre-min.js": [ "dist/jquery.js" ]
-				},
-				options: {
-					banner: "\n\n\n\n\n\n\n\n\n\n\n\n" + // banner line size must be preserved
-						"/*! jQuery v<%= pkg.version %> | " +
-						"(c) 2005, 2013 jQuery Foundation, Inc. | " +
-						"jquery.org/license */\n"
-				}
-			}
-		},
 		uglify: {
 			all: {
 				files: {
-					"dist/jquery.min.js": [ "dist/jquery.pre-min.js" ]
+					"dist/jquery.min.js": [ "dist/jquery.js" ]
 				},
 				options: {
-					// Keep our hard-coded banner
-					preserveComments: "some",
+					preserveComments: false,
 					sourceMap: "dist/jquery.min.map",
 					sourceMappingURL: "jquery.min.map",
 					report: "min",
 					beautify: {
 						ascii_only: true
 					},
+					banner: "/*! jQuery v<%= pkg.version %> | " +
+						"(c) 2005, 2013 jQuery Foundation, Inc. | " +
+						"jquery.org/license */",
 					compress: {
 						hoist_funs: false,
 						loops: false,
@@ -127,14 +116,6 @@ module.exports = function( grunt ) {
 					}
 				}
 			}
-		},
-		"post-uglify": {
-			all: {
-				src: [ "dist/jquery.min.map" ],
-				options: {
-					tempFiles: [ "dist/jquery.pre-min.js" ]
-				}
-			}
 		}
 	});
 
@@ -148,5 +129,5 @@ module.exports = function( grunt ) {
 	grunt.registerTask( "dev", [ "build:*:*", "jshint", "jscs" ] );
 
 	// Default grunt
-	grunt.registerTask( "default", [ "jsonlint", "dev", "pre-uglify", "uglify", "post-uglify", "dist:*", "compare_size" ] );
+	grunt.registerTask( "default", [ "jsonlint", "dev", "uglify", "dist:*", "compare_size" ] );
 };

build/tasks/uglify.js

@@ -1,46 +0,0 @@
-module.exports = function( grunt ) {
-
-	"use strict";
-
-	var fs = require( "fs" );
-
-	// Work around grunt-contrib-uglify sourceMap issues (jQuery #13776)
-	grunt.registerMultiTask( "pre-uglify", function() {
-		var banner = this.options().banner;
-
-		this.files.forEach(function( mapping ) {
-			// Join src
-			var input = mapping.src.map(function( file ) {
-				var contents = grunt.file.read( file );
-
-				// Strip banners
-				return contents
-					// Remove the main jQuery banner, it'll be replaced by the new banner anyway.
-					.replace( /^\/\*![\W\w]*?\*\/\n?/g, "" )
-					// Strip other banners preserving line count.
-					.replace( /^\/\*!(?:.|\n)*?\*\/\n?/gm, function( match ) {
-						return match.replace( /[^\n]/gm, "" );
-					});
-			}).join( "\n" );
-
-			// Write temp file (with optional banner)
-			grunt.file.write( mapping.dest, ( banner || "" ) + input );
-		});
-	});
-
-	// Change the map file to point back to jquery.js instead of jquery.pre-min.js.
-	// The problem is caused by the pre-uglify task.
-	grunt.registerMultiTask( "post-uglify", function() {
-		this.files.forEach(function( mapping ) {
-			mapping.src.forEach( function( src ) {
-				// Refer to the source jquery.js, not the temporary jquery.pre-min.js.
-				grunt.file.write( src, grunt.file.read( src ).replace( /\.pre-min\./g, "." ) );
-			});
-		});
-
-		// Remove temporary files.
-		this.options().tempFiles.forEach(function( fileName ) {
-			fs.unlink( fileName );
-		});
-	});
-};

package.json

@@ -33,7 +33,7 @@
     "grunt": "~0.4.1",
     "grunt-compare-size": "~0.4.0",
     "grunt-contrib-jshint": "~0.7.0",
-    "grunt-contrib-uglify": "~0.2.4",
+    "grunt-contrib-uglify": "~0.2.7",
     "grunt-contrib-watch": "~0.5.3",
     "grunt-git-authors": "~1.2.0",
     "grunt-jscs-checker": "~0.2.3",