message: [popover] -removed extra spacing
diff: @@ -169,8 +169,6 @@ export class MdlPopoverComponent {
  private updateDirection(event: Event, forElement: any = null) {
  const popoverElement = this.elementRef.nativeElement;
  - const targetRect = (<HTMLElement>event.target).getBoundingClientRect();
  - const viewHeight = window.innerHeight;
  const positionUpdateRequired = forElement && this.position;
  if (positionUpdateRequired) {
  @@ -188,6 +186,8 @@ export class MdlPopoverComponent {
  return;
  }
  + const targetRect = (<HTMLElement>event.target).getBoundingClientRect();
  + const viewHeight = window.innerHeight;
  const height = popoverElement.offsetHeight;
  if (height) {
  const bottomSpaceAvailable = viewHeight - targetRect.bottom
  