Remove libcore tests failures expectations for the concurrent collector.

Test: art/tools/run-libcore-tests.sh --mode=host --variant=X32 --debug (with ART_USE_READ_BARRIER=true)
Bug: 12687968
Change-Id: I470f11d0bc6e38011c5b8f3797f2c0e9ec1e56cc
diff --git a/tools/libcore_failures_concurrent_collector.txt b/tools/libcore_failures_concurrent_collector.txt
deleted file mode 100644
index 0e289a6..0000000
--- a/tools/libcore_failures_concurrent_collector.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-/*
- * This file contains expectations for ART's buildbot's concurrent collector
- * configurations. The purpose of this file is to temporary and quickly list
- * failing tests and not break the bots on the CC configurations, until they
- * are fixed or until the libcore expectation files get properly updated. The
- * script that uses this file is art/tools/run-libcore-tests.sh.
- *
- * It is also used to enable AOSP experiments, and not mess up with CTS's
- * expectations.
- */
-
-[
-]
diff --git a/tools/run-libcore-tests.sh b/tools/run-libcore-tests.sh
index 01c7f20..41faa69 100755
--- a/tools/run-libcore-tests.sh
+++ b/tools/run-libcore-tests.sh
@@ -43,10 +43,6 @@
 done
 
 expectations="--expectations art/tools/libcore_failures.txt"
-if [ "x$ART_USE_READ_BARRIER" = xtrue ]; then
-  # Tolerate some more failures on the concurrent collector configurations.
-  expectations="$expectations --expectations art/tools/libcore_failures_concurrent_collector.txt"
-fi
 
 emulator="no"
 if [ "$ANDROID_SERIAL" = "emulator-5554" ]; then