Remove misleading statistics.

These internal SQL counters were already misleading due to tedious
manual maintenance, and we now have much better tools for
investigating performance issues, such as these:

$ adb shell dumpsys dbinfo android.process.media

$ adb shell setprop log.tag.SQLiteStatements VERBOSE
$ adb shell setprop db.log.slow_query_threshold 0
$ adb shell setprop db.log.detailed 1

$ external/chromium-trace/systrace.py -b 128768 database

Bug: 122263279
Test: manual
Change-Id: I267115d12e06ee955c7c8dba3881eb19e145dcfe
1 file changed