switch to injector option

Author: mmalerba

src/material/select/select.ts

@@ -556,14 +556,17 @@ export class MatSelect
       );
     }
 
-    return new Observable(subscriber =>
-      runInInjectionContext(this._injector, () => {
-        afterNextRender(() => {
+    return new Observable(subscriber => () => {
+      afterNextRender(
+        () => {
           subscriber.next();
           subscriber.complete();
-        });
-      }),
-    ).pipe(switchMap(() => this.optionSelectionChanges));
+        },
+        {
+          injector: this._injector,
+        },
+      );
+    }).pipe(switchMap(() => this.optionSelectionChanges));
   }) as Observable<MatOptionSelectionChange>;
 
   /** Event emitted when the select panel has been toggled. */