refactor(@angular-devkit/build-angular): remove nonexistent argument from rxjs path mapping call

The rxjs path mapping function does not have any parameters and has not since version 5.5.0 which is not supported.

(cherry picked from commit d918af3)

Author: clydin

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/common.ts

@@ -36,7 +36,7 @@ import { NamedLazyChunksPlugin } from '../../plugins/named-chunks-plugin';
 import { OptimizeCssWebpackPlugin } from '../../plugins/optimize-css-webpack-plugin';
 import { ScriptsWebpackPlugin } from '../../plugins/scripts-webpack-plugin';
 import { WebpackRollupLoader } from '../../plugins/webpack';
-import { findAllNodeModules, findUp } from '../../utilities/find-up';
+import { findAllNodeModules } from '../../utilities/find-up';
 import { WebpackConfigOptions } from '../build-options';
 import { getEsVersionForFileName, getOutputHashFormat, normalizeExtraEntryPoints } from './utils';
 
@@ -55,11 +55,6 @@ export function getCommonConfig(wco: WebpackConfigOptions): Configuration {
     vendor: vendorSourceMap,
   } = buildOptions.sourceMap;
 
-  const nodeModules = findUp('node_modules', projectRoot);
-  if (!nodeModules) {
-    throw new Error('Cannot locate node_modules directory.');
-  }
-
   const extraPlugins: Plugin[] = [];
   const extraRules: Rule[] = [];
   const entryPoints: { [key: string]: string[] } = {};
@@ -363,7 +358,7 @@ export function getCommonConfig(wco: WebpackConfigOptions): Configuration {
       ? 'rxjs/_esm2015/path-mapping'
       : 'rxjs/_esm5/path-mapping';
     const rxPaths = require(require.resolve(rxjsPathMappingImport, { paths: [projectRoot] }));
-    alias = rxPaths(nodeModules);
+    alias = rxPaths();
   } catch {}
 
   const extraMinimizers = [];