[TimeStats] Default-disable stats collection

Now that we're ramping up collection in droidfood populations, we can
default-disable now and begin ramping up.

Bug: 148116614
Test: adb shell dumpsys SurfaceFlinger --timestats -dump
Change-Id: I48ac6be7915539f681c0cbbd089513a7a0222a0a
diff --git a/services/surfaceflinger/TimeStats/TimeStats.h b/services/surfaceflinger/TimeStats/TimeStats.h
index 71f06af..67b9d10 100644
--- a/services/surfaceflinger/TimeStats/TimeStats.h
+++ b/services/surfaceflinger/TimeStats/TimeStats.h
@@ -182,6 +182,8 @@
               std::optional<size_t> maxPulledLayers,
               std::optional<size_t> maxPulledHistogramBuckets);
 
+    ~TimeStats() override;
+
     void onBootFinished() override;
     void parseArgs(bool asProto, const Vector<String16>& args, std::string& result) override;
     bool isEnabled() override;