Revert "Add jvm mode to run-libcore-tests.sh"

Reason for revert: Breaks ART buildbots.

This reverts commit 938ead39458cb766432932801d4c6ae25286ef87.
diff --git a/tools/run-libcore-tests.sh b/tools/run-libcore-tests.sh
index c707b3e..7dea61e 100755
--- a/tools/run-libcore-tests.sh
+++ b/tools/run-libcore-tests.sh
@@ -64,7 +64,7 @@
   Run libcore tests using the vogar testing tool.
 
   Required parameters:
-    --mode=device|host|jvm Specify where tests should be run.
+    --mode=device|host     Specify where tests should be run.
 
   Optional parameters:
     --debug                Use debug version of ART (device|host only).
@@ -151,7 +151,7 @@
 # Run tests that use the getrandom() syscall? (Requires Linux 3.17+).
 getrandom=true
 
-# Execution mode specifies where to run tests (device|host|jvm).
+# Execution mode specifies where to run tests (device|host).
 execution_mode=""
 
 vogar_args=""
@@ -172,10 +172,6 @@
       vogar_args="$vogar_args $1 --vm-arg -Ximage:/non/existent/vogar.art"
       execution_mode="host"
       ;;
-    --mode=jvm)
-      vogar_args="$vogar_args $1"
-      execution_mode="jvm"
-      ;;
     --no-getrandom)
       getrandom=false
       ;;
@@ -261,35 +257,33 @@
   fi
 fi  # $execution_mode = "device"
 
-if [ $execution_mode = "device" -o $execution_mode = "host" ]; then
-  # set the toolchain to use.
-  vogar_args="$vogar_args --toolchain d8 --language CUR"
+# set the toolchain to use.
+vogar_args="$vogar_args --toolchain d8 --language CUR"
 
-  # JIT settings.
-  if $use_jit; then
-    vogar_args="$vogar_args --vm-arg -Xcompiler-option --vm-arg --compiler-filter=quicken"
-  fi
-  vogar_args="$vogar_args --vm-arg -Xusejit:$use_jit"
+# JIT settings.
+if $use_jit; then
+  vogar_args="$vogar_args --vm-arg -Xcompiler-option --vm-arg --compiler-filter=quicken"
+fi
+vogar_args="$vogar_args --vm-arg -Xusejit:$use_jit"
 
-  # gcstress may lead to timeouts, so we need dedicated expectations files for it.
-  if $gcstress; then
-    expectations="$expectations --expectations art/tools/libcore_gcstress_failures.txt"
-    if $debug; then
-      expectations="$expectations --expectations art/tools/libcore_gcstress_debug_failures.txt"
-    fi
-  else
-    # We only run this package when user has not specified packages
-    # to run and not under gcstress as it can cause timeouts. See
-    # b/78228743.
-    working_packages+=("libcore.libcore.icu")
+# gcstress may lead to timeouts, so we need dedicated expectations files for it.
+if $gcstress; then
+  expectations="$expectations --expectations art/tools/libcore_gcstress_failures.txt"
+  if $debug; then
+    expectations="$expectations --expectations art/tools/libcore_gcstress_debug_failures.txt"
   fi
+else
+  # We only run this package when user has not specified packages
+  # to run and not under gcstress as it can cause timeouts. See
+  # b/78228743.
+  working_packages+=("libcore.libcore.icu")
+fi
 
-  if $getrandom; then :; else
-    # Ignore failures in tests that use the getrandom() syscall (which requires
-    # Linux 3.17+). This is needed on fugu (Nexus Player) devices, where the
-    # kernel is Linux 3.10.
-    expectations="$expectations --expectations art/tools/libcore_no_getrandom_failures.txt"
-  fi
+if $getrandom; then :; else
+  # Ignore failures in tests that use the getrandom() syscall (which requires
+  # Linux 3.17+). This is needed on fugu (Nexus Player) devices, where the
+  # kernel is Linux 3.10.
+  expectations="$expectations --expectations art/tools/libcore_no_getrandom_failures.txt"
 fi
 
 if [ ! -t 1 ] ; then