Reland of Stop silently accepting unsupported flags in test binaries

webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc

Index: webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc b/webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc
index e39f1efa26c8eee1623ef7950ccf71e00f870e5c..79a525bccfd8cfbddf5a6d4f7889ac0211511114 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/test/kenny.cc
@@ -384,10 +384,8 @@
     sscanf(argv[CodingMode+1], "%s", bottleneck_file);
     f_bn = fopen(bottleneck_file, "rb");
     if (f_bn  == NULL) {
-      printf("No value provided for BottleNeck and cannot read file %s\n",
-             bottleneck_file);
-      exit(0);  // TODO(oprypin): don't silence this error
-      // FAIL() << "Cannot read file " << bottleneck_file;
+      printf("No value provided for BottleNeck\n");
+      FAIL() << "Cannot read file " << bottleneck_file;
     } else {
       int aux_var;
       printf("reading bottleneck rates from file %s\n\n",bottleneck_file);