Remove remaining references to defunct parameter `--failure-summary`.

pkg/front_end/lib/src/fasta/TESTING.md

Index: pkg/front_end/lib/src/fasta/TESTING.md
diff --git a/pkg/front_end/lib/src/fasta/TESTING.md b/pkg/front_end/lib/src/fasta/TESTING.md
index 570c8e08c25984dfe5b0556beb4ee764d0285408..251e9da319b83655cd0d15a13ab449b1d2a57168 100644
--- a/pkg/front_end/lib/src/fasta/TESTING.md
+++ b/pkg/front_end/lib/src/fasta/TESTING.md
@@ -17,7 +17,7 @@ Most of the tests below use a 32-bit build because the test runs significantly f
 The absolutely bare minimum of testing is the basic unit tests:
 
 ```
-./tools/test.py -mrelease 'pkg/front_end|*fasta*' --checked --time -pcolor --report --failure-summary -aia32
+./tools/test.py -mrelease 'pkg/front_end|*fasta*' --checked --time -pcolor --report -aia32
 ```
 
 ## Testing dart2js
@@ -26,10 +26,10 @@ If you're making changes to dart2js, it most likely involves the scanner or pars
 
 ```
 # Unit tests for dart2js
-./tools/test.py --dart2js-batch --time -pcolor --report --failure-summary -aia32 -mrelease --checked dart2js
+./tools/test.py --dart2js-batch --time -pcolor --report -aia32 -mrelease --checked dart2js
 
 # Language and co19, dart2js.
-./tools/test.py --dart2js-batch --time -pcolor --report --failure-summary -aia32 -mrelease -cdart2js -rd8 language co19
+./tools/test.py --dart2js-batch --time -pcolor --report -aia32 -mrelease -cdart2js -rd8 language co19
 ```
 
 ## Testing the Dart VM
@@ -40,7 +40,7 @@ Note that this test requires a 64-bit build because app-jit snapshot does not wo
 
 ```
 # Language, co19, kernel, for VM using Fasta.
-./tools/build.py -mrelease runtime_kernel && ./tools/test.py -mrelease -cdartk co19 language kernel --time -pcolor --report --failure-summary -j16
+./tools/build.py -mrelease runtime_kernel && ./tools/test.py -mrelease -cdartk co19 language kernel --time -pcolor --report -j16
 ```