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Revert "vp8: Real-time mode: reduce mode_check_freq thresh for speed 10."

This reverts commit 4a7424adba7a65766a92635dc67b6e7d94646693.

Reason for revert: <INSERT REASONING HERE>
Possibly causing test failures in roll into chromium.

Original change's description:
> vp8: Real-time mode: reduce mode_check_freq thresh for speed 10.
> 
> Reduces quality regression at speed 10 for real-time mode.
> 
> Change-Id: I9f624bea9ca262dab32ce9de7d6d91175d6becc8
> 

TBR=marpan@google.com,builds@webmproject.org,jianj@google.com
# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I1defcb74e78a5a3bd29b7d1b21a96a79fa26a457

--- a/vp8/encoder/onyx_if.c

+++ b/vp8/encoder/onyx_if.c

@@ -728,7 +728,6 @@

   SPEED_FEATURES *sf = &cpi->sf;

   int Mode = cpi->compressor_speed;

   int Speed = cpi->Speed;

-  int Speed2;

   int i;

   VP8_COMMON *cm = &cpi->common;

   int last_improved_quant = sf->improved_quant;

@@ -830,16 +829,9 @@

   cpi->mode_check_freq[THR_V_PRED] = cpi->mode_check_freq[THR_H_PRED] =

       cpi->mode_check_freq[THR_B_PRED] =

           speed_map(Speed, mode_check_freq_map_vhbpred);

-

-  // For real-time mode at speed 10 keep the mode_check_freq threshold

-  // for NEW1 similar to that of speed 9.

-  Speed2 = Speed;

-  if (cpi->Speed == 10 && Mode == 2) Speed2 = RT(9);

-  cpi->mode_check_freq[THR_NEW1] = speed_map(Speed2, mode_check_freq_map_new1);

-

+  cpi->mode_check_freq[THR_NEW1] = speed_map(Speed, mode_check_freq_map_new1);

   cpi->mode_check_freq[THR_NEW2] = cpi->mode_check_freq[THR_NEW3] =

       speed_map(Speed, mode_check_freq_map_new2);

-

   cpi->mode_check_freq[THR_SPLIT1] =

       speed_map(Speed, mode_check_freq_map_split1);

   cpi->mode_check_freq[THR_SPLIT2] = cpi->mode_check_freq[THR_SPLIT3] =