Use "= delete" for DISALLOW_COPY and DISALLOW_ASSIGN.

This will guarantee the error to be at compile time, and not rely on
the call visibility (private).

DISALLOW_COPY_AND_ASSIGN and DISSALOW_IMPLICIT_CONSTRUCTORS can't be
changed yet because they are redefine in different place in the code
base.

BUG=447156

Review URL: https://codereview.chromium.org/1151443003

Cr-Commit-Position: refs/heads/master@{#331017}
1 file changed