logd: drop can_read_security_logs

This has become useless after refactoring; we instead ensure that the
LOG_ID_SECURITY bit isn't set in log_mask, instead of having this
additional check.

Test: logging unit tests
Change-Id: Id47b288d056ebf2b5bd26be94006f17c24fafd31
diff --git a/logd/LogWriter.h b/logd/LogWriter.h
index b6c5b67..d43c604 100644
--- a/logd/LogWriter.h
+++ b/logd/LogWriter.h
@@ -23,8 +23,7 @@
 // An interface for writing logs to a reader.
 class LogWriter {
   public:
-    LogWriter(uid_t uid, bool privileged, bool can_read_security_logs)
-        : uid_(uid), privileged_(privileged), can_read_security_logs_(can_read_security_logs) {}
+    LogWriter(uid_t uid, bool privileged) : uid_(uid), privileged_(privileged) {}
     virtual ~LogWriter() {}
 
     virtual bool Write(const logger_entry& entry, const char* msg) = 0;
@@ -35,12 +34,10 @@
     uid_t uid() const { return uid_; }
 
     bool privileged() const { return privileged_; }
-    bool can_read_security_logs() const { return can_read_security_logs_; }
 
   private:
     uid_t uid_;
 
     // If this writer sees logs from all UIDs or only its own UID.  See clientHasLogCredentials().
     bool privileged_;
-    bool can_read_security_logs_;  // If this writer sees security logs.  See CanReadSecurityLogs().
 };
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