Remove "best" deadline parameter from aomenc.

This option increases runtime by 20% and is only marginally
better than good cpu-used=0:

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.3382 | -0.3911 | -0.4875 |  -0.2982 | -0.2992 | -0.3164 |    -0.3686

It is also not well integrated with speed_features.c, which is
the main reason for the removal.

Change-Id: If88c50367f63b860ad57f650869b978ec7734aad
diff --git a/test/encode_test_driver.h b/test/encode_test_driver.h
index 5de949d..dd07b94 100644
--- a/test/encode_test_driver.h
+++ b/test/encode_test_driver.h
@@ -27,24 +27,15 @@
 class CodecFactory;
 class VideoSource;
 
-enum TestMode {
-  kRealTime,
-  kOnePassGood,
-  kOnePassBest,
-  kTwoPassGood,
-  kTwoPassBest
-};
-#define ALL_TEST_MODES                                                        \
-  ::testing::Values(::libaom_test::kRealTime, ::libaom_test::kOnePassGood,    \
-                    ::libaom_test::kOnePassBest, ::libaom_test::kTwoPassGood, \
-                    ::libaom_test::kTwoPassBest)
-
-#define ONE_PASS_TEST_MODES                                                \
+enum TestMode { kRealTime, kOnePassGood, kTwoPassGood };
+#define ALL_TEST_MODES                                                     \
   ::testing::Values(::libaom_test::kRealTime, ::libaom_test::kOnePassGood, \
-                    ::libaom_test::kOnePassBest)
+                    ::libaom_test::kTwoPassGood)
 
-#define TWO_PASS_TEST_MODES \
-  ::testing::Values(::libaom_test::kTwoPassGood, ::libaom_test::kTwoPassBest)
+#define ONE_PASS_TEST_MODES \
+  ::testing::Values(::libaom_test::kRealTime, ::libaom_test::kOnePassGood)
+
+#define TWO_PASS_TEST_MODES ::testing::Values(::libaom_test::kTwoPassGood)
 
 // Provides an object to handle the libaom get_cx_data() iteration pattern
 class CxDataIterator {