refactor(compiler): remove private exports

All of `@angular/compiler` is private, so we can export
everything we need directly.

modules/@angular/platform-server/src/parse5_adapter.ts

@@ -11,7 +11,7 @@ const parse5 = require('parse5');
 import {ListWrapper} from '../src/facade/collection';
 import {DomAdapter, setRootDomAdapter} from './private_import_platform-browser';
 import {isPresent, isBlank, global, setValueOnPath} from '../src/facade/lang';
-import {SelectorMatcher, CssSelector} from './private_import_compiler';
+import {SelectorMatcher, CssSelector} from '@angular/compiler';
 
 let treeAdapter: any;