chore: adjust formatting to new clang-format.

- fixes wrapping for object literal keys called `template`.
- spacing in destructuring expressions.
- changes to keep trailing return types of functions closer to their
  function declaration.
- better formatting of string literals.

Closes #4828

modules/angular2/src/http/backends/mock_backend.ts

@@ -6,7 +6,7 @@ import {Connection, ConnectionBackend} from '../interfaces';
 import {isPresent} from 'angular2/src/core/facade/lang';
 import {BaseException, WrappedException} from 'angular2/src/core/facade/exceptions';
 var Rx = require('@reactivex/rxjs/dist/cjs/Rx');
-let{Subject, ReplaySubject} = Rx;
+let {Subject, ReplaySubject} = Rx;
 
 /**
  *