Replace DISALLOW_COPY_AND_ASSIGN with deleted constructor.

BUG=b:190446478
TEST=CQ

Change-Id: I89ffcaa8443f761f32380504de1ac6ae5b200510
Reviewed-on: https://chromium-review.googlesource.com/c/weave/libweave/+/3017632
Reviewed-by: Grace Cham <hscham@chromium.org>
Commit-Queue: Qijiang Fan <fqj@google.com>
Tested-by: Qijiang Fan <fqj@google.com>
30 files changed