adb: properly erase destroyed jdwp_trackers.

std::remove_if moves to-be-removed elements to the end of the vector
and returns an iterator that must be .erased.

Bug: http://b/35772578
Test: mma
Change-Id: Idfe8520e176204ac5ce000c30704873a3ffe6c9c

adb/jdwp_service.cpp

@@ -571,7 +571,8 @@ static void jdwp_tracker_close(asocket* s) {
     remove_socket(s);
 
     auto pred = [s](const auto& tracker) { return tracker.get() == s; };
-    std::remove_if(_jdwp_trackers.begin(), _jdwp_trackers.end(), pred);
+    _jdwp_trackers.erase(std::remove_if(_jdwp_trackers.begin(), _jdwp_trackers.end(), pred),
+                         _jdwp_trackers.end());
 }
 
 static void jdwp_tracker_ready(asocket* s) {