Revert^2 "Re-enable MonochromeRealtimeTest"

This reverts commit b5556134a5b78d467fe870133498cf9b1ac46abf.
Reason for revert: Fix is added in patchset 2.

Change-Id: Ib938fcb1bbc14bed2833e3ff40aeee6053cf8bf3

test/monochrome_test.cc

diff --git a/test/monochrome_test.cc b/test/monochrome_test.cc
index cfc16d0..78afd4f 100644
--- a/test/monochrome_test.cc
+++ b/test/monochrome_test.cc
@@ -55,6 +55,8 @@
       encoder->Control(AOME_SET_CPUUSED, GET_PARAM(3));
       if (mode_ == ::libaom_test::kAllIntra) {
         encoder->Control(AOME_SET_CQ_LEVEL, kCqLevel);
+      } else if (mode_ == ::libaom_test::kRealTime) {
+        encoder->Control(AOME_SET_MAX_INTRA_BITRATE_PCT, 10000);
       }
       if (lossless_) {
         encoder->Control(AV1E_SET_LOSSLESS, 1);
@@ -181,14 +183,7 @@
 
 class MonochromeRealtimeTest : public MonochromeTest {};
 
-#if CONFIG_REALTIME_ONLY
-// TODO: https://crbug.com/aomedia/376504476 - Enable this test after large
-// PSNR differences are resolved in this configuration.
-#define MAYBE_TestMonochromeEncoding DISABLED_TestMonochromeEncoding
-#else
-#define MAYBE_TestMonochromeEncoding TestMonochromeEncoding
-#endif
-TEST_P(MonochromeRealtimeTest, MAYBE_TestMonochromeEncoding) {
+TEST_P(MonochromeRealtimeTest, TestMonochromeEncoding) {
   ::libaom_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
                                        30, 1, 0, 30);
   init_flags_ = AOM_CODEC_USE_PSNR;
@@ -201,6 +196,7 @@
   cfg_.rc_buf_optimal_sz = 5000;
   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
 
+#if CONFIG_AV1_DECODER
   // Check that the chroma planes are equal across all frames
   std::vector<int>::const_iterator iter = chroma_value_list_.begin();
   int initial_chroma_value = *iter;
@@ -208,6 +204,7 @@
     // Check that all decoded frames have the same constant chroma planes.
     EXPECT_EQ(*iter, initial_chroma_value);
   }
+#endif
 }
 
 #if !CONFIG_REALTIME_ONLY