Fix dangerous unsafe_get() in SensorRecord

Change raw pointers to wp<> and constify relevant lines in
SensorRecord.

Bug: 30261110

Change-Id: I7f28c593366af44192991061fa5f71cf925b22a8
(cherry picked from commit ded526e8c3539b5986b46dffc1ff8ab15d7da570)
diff --git a/services/sensorservice/SensorEventConnection.cpp b/services/sensorservice/SensorEventConnection.cpp
index c1e1bad..f2f1444 100644
--- a/services/sensorservice/SensorEventConnection.cpp
+++ b/services/sensorservice/SensorEventConnection.cpp
@@ -206,7 +206,7 @@
 status_t SensorService::SensorEventConnection::sendEvents(
         sensors_event_t const* buffer, size_t numEvents,
         sensors_event_t* scratch,
-        SensorEventConnection const * const * mapFlushEventsToConnections) {
+        wp<const SensorEventConnection> const * mapFlushEventsToConnections) {
     // filter out events not for this connection
     int count = 0;
     Mutex::Autolock _l(mConnectionLock);
@@ -234,7 +234,7 @@
             FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
             // Check if there is a pending flush_complete event for this sensor on this connection.
             if (buffer[i].type == SENSOR_TYPE_META_DATA && flushInfo.mFirstFlushPending == true &&
-                    this == mapFlushEventsToConnections[i]) {
+                    mapFlushEventsToConnections[i] == this) {
                 flushInfo.mFirstFlushPending = false;
                 ALOGD_IF(DEBUG_CONNECTIONS, "First flush event for sensor==%d ",
                         buffer[i].meta_data.sensor);
@@ -255,7 +255,7 @@
                 // from the same sensor_handle AND the current connection is mapped to the
                 // corresponding flush_complete_event.
                 if (buffer[i].type == SENSOR_TYPE_META_DATA) {
-                    if (this == mapFlushEventsToConnections[i]) {
+                    if (mapFlushEventsToConnections[i] == this) {
                         scratch[count++] = buffer[i];
                     }
                     ++i;