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This commit updates blink web_tests to use pywebsocket3. It updates
blinkpy/server/pywebsocket to import pywebsocket3 for its path.

This commit also fixes the websocket handlers in web_tests. It update
the handlers to use pywebsocket3 functions instead of old ones, and also
updates the websocket handlers that use chr() to generate bytes string,
to use util.pack_byte(), since chr() does not generate bytes in
python 3.

Change-Id: I2fbc365571b2ca0ee947355a2f95700350675fb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059705Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Keita Suzuki <suzukikeita@google.com>
Cr-Commit-Position: refs/heads/master@{#748556}