Fix dexlist_test

xbin is deprecated, dexlist installs to /system/bin now.

Bug: 31469510
Test: m test-art-target-gtest-dexlist_test
Change-Id: I352ae9eaaf2f9e4ce6682c5022c138b07d29ccca
diff --git a/dexlist/dexlist_test.cc b/dexlist/dexlist_test.cc
index 9a65ba6..da1dd7f 100644
--- a/dexlist/dexlist_test.cc
+++ b/dexlist/dexlist_test.cc
@@ -43,11 +43,7 @@
   // Runs test with given arguments.
   bool Exec(const std::vector<std::string>& args, std::string* error_msg) {
     std::string file_path = GetTestAndroidRoot();
-    if (IsHost()) {
-      file_path += "/bin/dexlist";
-    } else {
-      file_path += "/xbin/dexlist";
-    }
+    file_path += "/bin/dexlist";
     EXPECT_TRUE(OS::FileExists(file_path.c_str())) << file_path << " should be a valid file path";
     std::vector<std::string> exec_argv = { file_path };
     exec_argv.insert(exec_argv.end(), args.begin(), args.end());