chore(lint): remove unused imports (#11923)

This was done automatically by tslint, which can now fix issues it finds.
The fixer is still pending in PR https://github.com/palantir/tslint/pull/1568
Also I have a local bugfix for https://github.com/palantir/tslint/issues/1569
which causes too many imports to be deleted.

modules/@angular/benchpress/src/runner.ts

@@ -9,7 +9,7 @@
 import {Provider, ReflectiveInjector} from '@angular/core';
 
 import {Options} from './common_options';
-import {isBlank, isPresent} from './facade/lang';
+import {isPresent} from './facade/lang';
 import {Metric} from './metric';
 import {MultiMetric} from './metric/multi_metric';
 import {PerflogMetric} from './metric/perflog_metric';