Remove unnecessary rollup plugin

This broke the build on Windows

.typings/rollup-plugin-alias.d.ts

@@ -1,4 +0,0 @@
-declare module "rollup-plugin-alias" {
-    const alias(options: { [_: string]: string }) => void;
-    export default alias;
-}

package.json

@@ -98,7 +98,6 @@
     "npm-run-all": "^4.1.5",
     "nyc": "^14.1.1",
     "rollup": "^1.16.6",
-    "rollup-plugin-alias": "^1.5.2",
     "rollup-plugin-commonjs": "^10.0.1",
     "rollup-plugin-json": "^4.0.0",
     "rollup-plugin-multi-entry": "^2.1.0",

rollup.config.ts

@@ -1,11 +1,9 @@
-/// <reference path=".typings/rollup-plugin-alias.d.ts" />
 /// <reference path=".typings/rollup-plugin-commonjs.d.ts" />
 /// <reference path=".typings/rollup-plugin-json.d.ts" />
 /// <reference path=".typings/rollup-plugin-node-resolve.d.ts" />
 /// <reference path=".typings/rollup-plugin-sourcemaps.d.ts" />
 /// <reference path=".typings/rollup-plugin-visualizer.d.ts" />
 
-import alias from "rollup-plugin-alias";
 import commonjs from "rollup-plugin-commonjs";
 import json from "rollup-plugin-json";
 import nodeResolve from "rollup-plugin-node-resolve";
@@ -69,13 +67,6 @@ const browserConfig = {
     banner
   },
   plugins: [
-    alias({
-      "./defaultHttpClient": "./defaultHttpClient.browser",
-      "./policies/msRestUserAgentPolicy": "./policies/msRestUserAgentPolicy.browser",
-      "./policies/proxyPolicy": "./policies/proxyPolicy.browser",
-      "./util/xml": "./util/xml.browser",
-      "./util/base64": "./util/base64.browser",
-    }),
     nodeResolve({
       mainFields: ["module", "main", "browser"]
     }),