stick to new dash manifest uri after http 302 redirection

[davibe]

Related to discussion in #6907

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[davibe]

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[ojw28]

As per my comment in #6907, this change will need updating to let manifest.location take priority. You should also do the isSameUriInstance check as above. So I think you probably want to replace L810 to L826 with something that looks more like (disclaimer: untested):

Uri newManifestUri = manifest.location != null ? manifest.location : loadable.getUri();
synchronized (manifestUriLock) {
  // This condition checks that replaceManifestUri wasn't called between the start and end of
  // this load. If it was, we ignore newManifestUri and prefer the manual replacement.
  @SuppressWarnings("ReferenceEquality")
  boolean isSameUriInstance = loadable.dataSpec.uri == manifestUri;
  if (isSameUriInstance) {
    manifestUri = newManifestUri;
  }
}

[ojw28]

As per our contribution guidelines, pull requests should be made to the dev-v2 branch. Please close this one and send a new one to that branch instead. See also the inline comment on the code. Thanks!

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