Remove alternative frontend flag.

Change-Id: Ibcd15cb417c944a009a496332e32e2c0e13a3d0c
diff --git a/build.gradle b/build.gradle
index f8d61e6..11e3322 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1820,11 +1820,6 @@
         systemProperty 'test_git_HEAD_sha1', project.property('HEAD_sha1')
     }
 
-    if (project.hasProperty('alternative_frontend')) {
-        println "NOTE: Running with alternative frontend"
-        systemProperty 'com.android.tools.r8.useAlternativeFrontend', true
-    }
-
     dependsOn getJarsFromSupportLibs
     // R8.jar is required for running bootstrap tests.
     dependsOn R8
diff --git a/tools/test.py b/tools/test.py
index fda24ee..be271f2 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -124,9 +124,6 @@
   result.add_option('--fail-fast', '--fail_fast',
       default=False, action='store_true',
       help='Stop on first failure. Passes --fail-fast to gradle test runner.')
-  result.add_option('--alternative-frontend', '--alternative_frontend',
-      default=False, action='store_true',
-      help='Use the alternative (eg, non-default) classfile frontend.')
   return result.parse_args()
 
 def archive_failures():
@@ -202,8 +199,6 @@
     if not os.path.exists(options.use_golden_files_in):
       os.makedirs(options.use_golden_files_in)
     gradle_args.append('-PHEAD_sha1=' + utils.get_HEAD_sha1())
-  if options.alternative_frontend:
-    gradle_args.append('-Palternative_frontend')
   if (not options.no_r8lib) and options.r8lib_no_deps:
     print('Cannot run tests on r8lib with and without deps. R8lib is now default target.')
     exit(1)