Remove kTruncatingTimestampAtomBlackList

Use shouldTruncateTimestamp flag in LogEvent instead of the blacklist
to determine whether timestamp should be truncated.

Bug: 150414373
Test: bit statsd_test:*
Change-Id: I4e21ae4909484dd898b9fcd3ce7a018f5e9d982f
diff --git a/cmds/statsd/src/logd/LogEvent.h b/cmds/statsd/src/logd/LogEvent.h
index 4eeb7d6..f78f105 100644
--- a/cmds/statsd/src/logd/LogEvent.h
+++ b/cmds/statsd/src/logd/LogEvent.h
@@ -145,7 +145,7 @@
     }
 
     // Default value = false
-    inline bool shouldTruncateTimestamp() {
+    inline bool shouldTruncateTimestamp() const {
         return mTruncateTimestamp;
     }