Remove references to mozRequestPointerLock and friends. NFC

The official `requestPointerLock` API is supported in all the browsers
that we support.

See https://developer.mozilla.org/en-US/docs/Web/API/Element/requestPointerLock

Author: sbc100

src/lib/libbrowser.js

@@ -146,32 +146,16 @@ var LibraryBrowser = {
 
       function pointerLockChange() {
         var canvas = Browser.getCanvas();
-        Browser.pointerLock = document['pointerLockElement'] === canvas ||
-                              document['mozPointerLockElement'] === canvas ||
-                              document['webkitPointerLockElement'] === canvas ||
-                              document['msPointerLockElement'] === canvas;
+        Browser.pointerLock = document.pointerLockElement === canvas;
       }
       var canvas = Browser.getCanvas();
       if (canvas) {
         // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
         // Module['forcedAspectRatio'] = 4 / 3;
 
-        canvas.requestPointerLock = canvas['requestPointerLock'] ||
-                                    canvas['mozRequestPointerLock'] ||
-                                    canvas['webkitRequestPointerLock'] ||
-                                    canvas['msRequestPointerLock'] ||
-                                    (() => {});
-        canvas.exitPointerLock = document['exitPointerLock'] ||
-                                 document['mozExitPointerLock'] ||
-                                 document['webkitExitPointerLock'] ||
-                                 document['msExitPointerLock'] ||
-                                 (() => {}); // no-op if function does not exist
-        canvas.exitPointerLock = canvas.exitPointerLock.bind(document);
+        canvas.exitPointerLock = document.exitPointerLock.bind(document);
 
         document.addEventListener('pointerlockchange', pointerLockChange, false);
-        document.addEventListener('mozpointerlockchange', pointerLockChange, false);
-        document.addEventListener('webkitpointerlockchange', pointerLockChange, false);
-        document.addEventListener('mspointerlockchange', pointerLockChange, false);
 
         if (Module['elementPointerLock']) {
           canvas.addEventListener("click", (ev) => {

src/lib/libhtml5.js

@@ -1595,10 +1595,9 @@ var LibraryHTML5 = {
     '$specialHTMLTargets'
 #endif
   ],
-  emscripten_set_pointerlockchange_callback_on_thread__docs: '/** @suppress {missingProperties} */', // Closure does not see document.body.mozRequestPointerLock etc.
   emscripten_set_pointerlockchange_callback_on_thread: (target, userData, useCapture, callbackfunc, targetThread) => {
     // TODO: Currently not supported in pthreads or in --proxy-to-worker mode. (In pthreads mode, document object is not defined)
-    if (!document || !document.body || (!document.body.requestPointerLock && !document.body.mozRequestPointerLock && !document.body.webkitRequestPointerLock && !document.body.msRequestPointerLock)) {
+    if (!document || !document.body?.requestPointerLock) {
       return {{{ cDefs.EMSCRIPTEN_RESULT_NOT_SUPPORTED }}};
     }
 
@@ -1644,10 +1643,9 @@ var LibraryHTML5 = {
     '$specialHTMLTargets'
 #endif
   ],
-  emscripten_set_pointerlockerror_callback_on_thread__docs: '/** @suppress {missingProperties} */', // Closure does not see document.body.mozRequestPointerLock etc.
   emscripten_set_pointerlockerror_callback_on_thread: (target, userData, useCapture, callbackfunc, targetThread) => {
     // TODO: Currently not supported in pthreads or in --proxy-to-worker mode. (In pthreads mode, document object is not defined)
-    if (!document || !document.body.requestPointerLock && !document.body.mozRequestPointerLock && !document.body.webkitRequestPointerLock && !document.body.msRequestPointerLock) {
+    if (!document || !document.body?.requestPointerLock) {
       return {{{ cDefs.EMSCRIPTEN_RESULT_NOT_SUPPORTED }}};
     }
 
@@ -1666,10 +1664,9 @@ var LibraryHTML5 = {
 
   emscripten_get_pointerlock_status__proxy: 'sync',
   emscripten_get_pointerlock_status__deps: ['$fillPointerlockChangeEventData'],
-  emscripten_get_pointerlock_status__docs: '/** @suppress {missingProperties} */', // Closure does not see document.body.mozRequestPointerLock etc.
   emscripten_get_pointerlock_status: (pointerlockStatus) => {
     if (pointerlockStatus) fillPointerlockChangeEventData(pointerlockStatus);
-    if (!document.body || (!document.body.requestPointerLock && !document.body.mozRequestPointerLock && !document.body.webkitRequestPointerLock && !document.body.msRequestPointerLock)) {
+    if (!document || !document.body?.requestPointerLock) {
       return {{{ cDefs.EMSCRIPTEN_RESULT_NOT_SUPPORTED }}};
     }
     return {{{ cDefs.EMSCRIPTEN_RESULT_SUCCESS }}};