fix(HtmlParser): correctly propagate the interpolation config across layers

modules/@angular/compiler/src/expression_parser/lexer.ts

@@ -8,7 +8,6 @@
 
 import {Injectable} from '@angular/core';
 import * as chars from '../chars';
-import {SetWrapper} from '../facade/collection';
 import {BaseException} from '../facade/exceptions';
 import {NumberWrapper, StringJoiner, StringWrapper, isPresent} from '../facade/lang';
 

modules/@angular/compiler/src/expression_parser/parser.ts

@@ -37,8 +37,7 @@ function _createInterpolateRegExp(config: InterpolationConfig): RegExp {
 export class Parser {
   private errors: ParserError[] = [];
 
-  constructor(/** @internal */
-              public _lexer: Lexer) {}
+  constructor(private _lexer: Lexer) {}
 
   parseAction(
       input: string, location: any,