fix(ddc): router, compiler, web worker fixes for DDC

Also enable DDC checks across all non-web worker playground apps. We are
now down to 2 DDC errors across all of them. The remaining two need to be
fixed in package:analyzer, not in angular.

BREAKING CHANGE:

- there's a chance of breakage as router's Instruction constructor
  signature changed.

Closes #6693

modules/playground/src/relative_assets/index.ts

@@ -1,12 +1,9 @@
 import {bootstrap} from 'angular2/bootstrap';
-import {reflector} from 'angular2/src/core/reflection/reflection';
-import {ReflectionCapabilities} from 'angular2/src/core/reflection/reflection_capabilities';
 
 import {Renderer, ElementRef, Component, Directive, Injectable} from 'angular2/core';
 import {MyCmp} from './my_cmp/my_cmp';
 
 export function main() {
-  reflector.reflectionCapabilities = new ReflectionCapabilities();
   bootstrap(RelativeApp);
 }