Add DISALLOW_COPY_AND_ASSIGN to TextMatchMarker

We're adding DISALLOW_COPY_AND_ASSIGN to CompositionMarker in
https://codereview.chromium.org/2908643002 and to SpellingMarker and
GrammarMarker in https://codereview.chromium.org/2911723002, so we should add
it to TextMatchMarker as well for consistency.

BUG=707867

Review-Url: https://codereview.chromium.org/2916753003
Cr-Commit-Position: refs/heads/master@{#476216}
1 file changed