Convert callbacks in //chrome/browser/chromeos/chromebox_for_meetings

This change converts callbacks from base::Bind and base::Callback to
Once/Repeating in //chrome/browser/chromeos/chromebox_for_meetings.

Bug: 1148570
Change-Id: I5ea12291720cc501393eae32d2a22a077dbb1e66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645515
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Kyle Williams <kdgwill@chromium.org>
Commit-Queue: Kyle Williams <kdgwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846383}

chrome/browser/chromeos/chromebox_for_meetings/service_adaptor_unittest.cc

@@ -55,9 +55,9 @@ class FakeDelegate : public ServiceAdaptor::Delegate {
   int connect_count = 0;
   int disconnect_count = 0;
   int bind_request_count = 0;
-  base::Closure connect_callback_;
-  base::Closure disconnect_callback_;
-  base::Closure bind_service_callback_;
+  base::RepeatingClosure connect_callback_;
+  base::RepeatingClosure disconnect_callback_;
+  base::RepeatingClosure bind_service_callback_;
 };
 
 class CfmServiceAdaptorTest : public testing::Test {