[fuchsia] early return in handler on disable
[fuchsia] early return in handler on disable

Tested:CQ

Change-Id: Ifd742a7bfb213e4286bad582c81963e2fb383551
Reviewed-on: https://chromium-review.googlesource.com/c/1309156
Reviewed-by: Scott Graham <e134406e1863f3b48b0795831afac5c0595efb36@chromium.org>
Commit-Queue: Francois Rousseau <abdb75be6d92482eb3ea75e9341306a6fcc3aacd@google.com>

chromium/crashpad,chromium/crashpad,chromium/crashpad