refactor(shadow_dom): remove ShadowDomStrategy in favor of @View(encapsulation)

BREAKING CHANGES:
- `ShadowDomStrategy` was removed. To specify the encapsulation of a component use `@View(encapsulation: ViewEncapsulation.NONE | ViewEncapsulation.EMULATED | ViewEncapsulation.NATIVE)`
- The default encapsulation strategy is now `ViewEncapsulation.EMULATED` if a component contains styles and `ViewEncapsulation.NONE` if it does not. Before this was always `NONE`.
- `ViewLoader` now returns the template as a string and the styles as a separate array

modules/examples/src/material/dialog/index.ts

@@ -67,7 +67,7 @@ class DemoApp {
     <p>There are {{numCoconuts}} coconuts.</p>
     <p>Return: <input (input)="updateValue($event)"></p>
     <button type="button" (click)="done()">Done</button>
-  `,
+  `
 })
 class SimpleDialogComponent {
   numCoconuts: number;