Stop passing "is live" to |Player.applyPlayRange_|

|applyPlayRange_| in |Player| was previously passed |isLive| but that
value would come from the timeline that it was already passed. Instead
of passing in |isLive| this updates |applyPlayRange_| to check the
the timeline for the "is live" condition.

Change-Id: I13efccd14b9177d2fd652347dce55338d74b7ec8
(cherry picked from commit d02959f3288ec140098d555559bcab9c51d02ca7)

lib/player.js

@@ -862,8 +862,7 @@ shaka.Player.prototype.load = async function(
 
     shaka.Player.applyPlayRange_(this.manifest_.presentationTimeline,
                                  this.config_.playRangeStart,
-                                 this.config_.playRangeEnd,
-                                 this.isLive());
+                                 this.config_.playRangeEnd);
 
     await this.drmEngine_.attach(video);
 
@@ -3416,21 +3415,20 @@ shaka.Player.prototype.shouldStreamText_ = function() {
 
 
 /**
- * Applys playRangeStart and playRangeEnd to the given timeline.
+ * Applies playRangeStart and playRangeEnd to the given timeline. This will
+ * only affect non-live content.
  *
  * @param {shaka.media.PresentationTimeline} timeline
  * @param {number} playRangeStart
  * @param {number} playRangeEnd
- * @param {boolean} isLive
  *
  * @private
  */
 shaka.Player.applyPlayRange_ = function(timeline,
                                         playRangeStart,
-                                        playRangeEnd,
-                                        isLive) {
+                                        playRangeEnd) {
   if (playRangeStart > 0) {
-    if (isLive) {
+    if (timeline.isLive()) {
       shaka.log.warning(
           '|playRangeStart| has been configured for live content. ' +
           'Ignoring the setting.');
@@ -3443,7 +3441,7 @@ shaka.Player.applyPlayRange_ = function(timeline,
   // presentation, update the duration unless it's live content.
   const fullDuration = timeline.getDuration();
   if (playRangeEnd < fullDuration) {
-    if (isLive) {
+    if (timeline.isLive()) {
       shaka.log.warning(
           '|playRangeEnd| has been configured for live content. ' +
           'Ignoring the setting.');