Common: Retire /apollo/data topic.

modules/common/adapters/adapter_gflags.cc

@@ -205,7 +205,6 @@ DEFINE_string(heading_topic, "/apollo/sensor/gnss/heading",
               "gnss heading topic name");
 DEFINE_string(rtcm_data_topic, "/apollo/sensor/gnss/rtcm_data",
               "gnss rtcm data topic name");
-DEFINE_string(data_topic, "/apollo/data", "Data topic.");
 DEFINE_string(tf_topic, "/tf", "Transform topic.");
 DEFINE_string(tf_static_topic, "/tf_static", "Transform static topic.");
 DEFINE_string(recorder_status_topic, "/apollo/data/recorder/status",

modules/common/adapters/adapter_gflags.h

@@ -106,9 +106,6 @@ DECLARE_string(rtcm_data_topic);
 // Guardian topic
 DECLARE_string(guardian_topic);
 
-// Data topic
-DECLARE_string(data_topic);
-
 // Transform topic
 DECLARE_string(tf_topic);
 DECLARE_string(tf_static_topic);