perf(drag-drop): remove expensive style recalculation (#14189)

Removes an expensive style recalculation of the entire body from `drag-drop`. The issue that the code was solving isn't very common (the user starts dragging and then they yank their cursor out of the edge of the screen on Safari) and when it happens, things will generally still work.

Author: crisbeto

src/cdk/drag-drop/drag-drop-registry.ts

@@ -10,7 +10,6 @@ import {Injectable, NgZone, OnDestroy, Inject} from '@angular/core';
 import {DOCUMENT} from '@angular/common';
 import {normalizePassiveListenerOptions} from '@angular/cdk/platform';
 import {Subject} from 'rxjs';
-import {toggleNativeDragInteractions} from './drag-styling';
 
 /** Event options that can be used to bind an active, capturing event. */
 const activeCapturingEventOptions = normalizePassiveListenerOptions({
@@ -123,10 +122,6 @@ export class DragDropRegistry<I, C extends {id: string}> implements OnDestroy {
       const moveEvent = isTouchEvent ? 'touchmove' : 'mousemove';
       const upEvent = isTouchEvent ? 'touchend' : 'mouseup';
 
-      // We need to disable the native interactions on the entire body, because
-      // the user can start marking text if they drag too far in Safari.
-      toggleNativeDragInteractions(this._document.body, false);
-
       // We explicitly bind __active__ listeners here, because newer browsers will default to
       // passive ones for `mousemove` and `touchmove`. The events need to be active, because we
       // use `preventDefault` to prevent the page from scrolling while the user is dragging.
@@ -163,7 +158,6 @@ export class DragDropRegistry<I, C extends {id: string}> implements OnDestroy {
 
     if (this._activeDragInstances.size === 0) {
       this._clearGlobalListeners();
-      toggleNativeDragInteractions(this._document.body, true);
     }
   }