Fix the test data for WPT of Compression Dictionary Transport

The CL [1] added WPT tests for Compression Dictionary Transport to the
Chromium repository. And, when they are merged to the WPT repository
[2], the test binary file `compressed.br-d.data` is recognized as a text
file, and its content was changed by a text encoding converter.
And after the wpt-import CL [3] imported the changed file to the
Chromium repository, the all tests which use `compressed.br-d.data` file
are failing.

To solve this problem, this CL changes `compressed-data.py` not to use
the data files, and use the data in the python file.

[1]: https://crrev.com/c/5401505
[2]: https://github.com/web-platform-tests/wpt/pull/45447
[3]: https://crrev.com/c/5417334

Fixed: 332571361
Bug: 1413922
Change-Id: I7fb59969fe6611ee4c126f49cd0b1af7e9e34640
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5418534


Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Patrick Meenan <pmeenan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282202}