chore: remove dead code

test-main.js

@@ -14,7 +14,6 @@ System.config({
     'benchpress/*': 'dist/js/dev/es5/benchpress/*.js',
     'angular2/*': 'dist/js/dev/es5/angular2/*.js',
     'angular2_material/*': 'dist/js/dev/es5/angular2_material/*.js',
-    'rtts_assert/*': 'dist/js/dev/es5/rtts_assert/*.js',
     '@reactivex/rxjs/*': 'node_modules/@reactivex/rxjs/*.js',
     'upgrade/*': 'dist/js/dev/es5/upgrade/*.js'
   }

tools/broccoli/trees/browser_tree.ts

@@ -13,9 +13,6 @@ import mergeTrees from '../broccoli-merge-trees';
 import replace from '../broccoli-replace';
 
 
-var projectRootDir = path.normalize(path.join(__dirname, '..', '..', '..', '..'));
-
-
 const kServedPaths = [
   // Relative (to /modules) paths to benchmark directories
   'benchmarks/src',