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vp9: Speed 8: reduce the adaptive_rd_thresh level.

Reduce the level from 4 to 2.
This gives ~1-2% quality gain on RTC set, with small decreaee in speed (~1-2% on mac).

Change-Id: I7d959731badcee3d45b2f4a08efe378765016a13

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -554,6 +554,9 @@

             vp9_noise_estimate_extract_level(&cpi->noise_estimate);

         if (noise_level >= kMedium) sf->short_circuit_low_temp_var = 2;

       }

+      // Since the short_circuit_low_temp_var is used, reduce the

+      // adaptive_rd_thresh level.

+      sf->adaptive_rd_thresh = 2;

     }

     sf->limit_newmv_early_exit = 0;

     sf->use_simple_block_yrd = 0;