Refactoring DataSpec constructor calls to use DataSpec.withUri() and DataSpec.subrange().

This reduces the number of calls to the DataSpec constructor and minimizes the number of files that need to be updated when adding a new DataSpec parameter (ex: followup []

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=205719005

extensions/cronet/src/main/java/com/google/android/exoplayer2/ext/cronet/CronetDataSource.java

@@ -622,15 +622,7 @@ public class CronetDataSource extends BaseDataSource implements HttpDataSource {
         request.followRedirect();
       } else {
         currentUrlRequest.cancel();
-        DataSpec redirectUrlDataSpec =
-            new DataSpec(
-                Uri.parse(newLocationUrl),
-                currentDataSpec.postBody,
-                currentDataSpec.absoluteStreamPosition,
-                currentDataSpec.position,
-                currentDataSpec.length,
-                currentDataSpec.key,
-                currentDataSpec.flags);
+        DataSpec redirectUrlDataSpec = currentDataSpec.withUri(Uri.parse(newLocationUrl));
         UrlRequest.Builder requestBuilder;
         try {
           requestBuilder = buildRequestBuilder(redirectUrlDataSpec);

library/core/src/main/java/com/google/android/exoplayer2/upstream/TeeDataSource.java

@@ -56,14 +56,7 @@ public final class TeeDataSource implements DataSource {
     }
     if (dataSpec.length == C.LENGTH_UNSET && bytesRemaining != C.LENGTH_UNSET) {
       // Reconstruct dataSpec in order to provide the resolved length to the sink.
-      dataSpec =
-          new DataSpec(
-              dataSpec.uri,
-              dataSpec.absoluteStreamPosition,
-              dataSpec.position,
-              bytesRemaining,
-              dataSpec.key,
-              dataSpec.flags);
+      dataSpec = dataSpec.subrange(0, bytesRemaining);
     }
     dataSinkNeedsClosing = true;
     dataSink.open(dataSpec);