Allow same matcher to cancel >1 event activation

Previously,we could only have one deactivation matcher for a given
metric. This meant that the same matcher could not be used to cancel
several (or all) event activations of a metric. This fixes that bug.

Test: bit statsd_test:*
Bug: 134185513
Change-Id: I9d74878c9e09bd1f58c8f3dcffe1092edf490329
diff --git a/cmds/statsd/src/StatsLogProcessor.h b/cmds/statsd/src/StatsLogProcessor.h
index ce75f78..f0db1b0 100644
--- a/cmds/statsd/src/StatsLogProcessor.h
+++ b/cmds/statsd/src/StatsLogProcessor.h
@@ -272,6 +272,7 @@
     FRIEND_TEST(MetricActivationE2eTest, TestCountMetric);
     FRIEND_TEST(MetricActivationE2eTest, TestCountMetricWithOneDeactivation);
     FRIEND_TEST(MetricActivationE2eTest, TestCountMetricWithTwoDeactivations);
+    FRIEND_TEST(MetricActivationE2eTest, TestCountMetricWithSameDeactivation);
     FRIEND_TEST(MetricActivationE2eTest, TestCountMetricWithTwoMetricsTwoDeactivations);
 
     FRIEND_TEST(DurationMetricE2eTest, TestOneBucket);