chore(*): remove unused selection service for hierarchical grid

Author: ddincheva

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-cell.component.ts

@@ -3,7 +3,6 @@ import { GridBaseAPIService } from '../api.service';
 import { ChangeDetectorRef, ElementRef, ChangeDetectionStrategy, Component,
      OnInit, HostListener, NgZone } from '@angular/core';
 import { IgxHierarchicalGridComponent } from './hierarchical-grid.component';
-import { IgxHierarchicalSelectionAPIService } from './selection';
 import { IgxGridSelectionService, IgxGridCRUDService } from '../../core/grid-selection';
 import { HammerGesturesManager } from '../../core/touch';
 
@@ -23,14 +22,12 @@ export class IgxHierarchicalGridCellComponent extends IgxGridCellComponent imple
         protected selectionService: IgxGridSelectionService,
         protected crudService: IgxGridCRUDService,
         public gridAPI: GridBaseAPIService<IgxHierarchicalGridComponent>,
-        public selection: IgxHierarchicalSelectionAPIService,
         public cdr: ChangeDetectorRef,
         private helement: ElementRef,
         protected zone: NgZone,
         touchManager: HammerGesturesManager
         ) {
             super(selectionService, crudService, gridAPI, cdr, helement, zone, touchManager);
-            this.hSelection = <IgxHierarchicalSelectionAPIService>selection;
          }
 
     ngOnInit() {

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.module.ts

@@ -9,7 +9,6 @@ import { IgxGridHierarchicalPipe, IgxGridHierarchicalPagingPipe } from './hierar
 import { IgxRowIslandComponent } from './row-island.component';
 import { IgxChildGridRowComponent } from './child-grid-row.component';
 import { IgxHierarchicalGridCellComponent } from './hierarchical-cell.component';
-import { IgxHierarchicalSelectionAPIService } from './selection';
 import { IgxRowIslandAPIService } from './row-island-api.service';
 import { IgxSelectModule } from '../../select/index';
 import { IgxGridComponent } from '../grid/grid.component';
@@ -44,7 +43,6 @@ import { IgxGridComponent } from '../grid/grid.component';
   ],
   providers: [
     IgxRowIslandAPIService,
-    IgxHierarchicalSelectionAPIService
   ],
   entryComponents: [
     IgxGridComponent

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.selection.spec.ts

@@ -1,7 +1,7 @@
 import { configureTestSuite } from '../../test-utils/configure-suite';
 import { async, TestBed, fakeAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { IgxHierarchicalGridModule } from './index';
+import { GridSelectionMode, IgxHierarchicalGridModule } from './index';
 import { IgxHierarchicalGridComponent } from './hierarchical-grid.component';
 import { wait, UIInteractions } from '../../test-utils/ui-interactions.spec';
 import { IgxHierarchicalRowComponent } from './hierarchical-row.component';
@@ -13,7 +13,6 @@ import {
     IgxHierarchicalGridRowSelectionNoTransactionsComponent
 } from '../../test-utils/hierarhical-grid-components.spec';
 import { HelperUtils } from '../../test-utils/helper-utils.spec';
-import { GridSelectionMode } from '../grid';
 
 describe('IgxHierarchicalGrid selection #hGrid', () => {
     configureTestSuite();