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This removes the BluetoothRemoteGattCharacteristic::WriteWithoutResponse
method. There are no longer any users of this method.

BluetoothRemoteGattCharacteristic::WriteRemoteCharacteristic can now be
used instead since it now takes a |write_type| parameter.

This also removes the last use of IsWritableWithoutResponse() so it can
be removed as well.

Bug: 831524
Change-Id: Ib6c929db61bcee732cf0cd1c5822bde8cfa9a8f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191234Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Vincent Scheib <scheib@chromium.org>
Commit-Queue: David Lechner <david@pybricks.com>
Cr-Commit-Position: refs/heads/master@{#770282}