art: Try to fix parsed_options_test on the build server

(It works fine locally because environment variables are defined
differently)

Also some minor cleanup elsewhere pointed out in the previous code
review.

Change-Id: I80650d2be6ce467b838db85eb130a0020d7c1480
diff --git a/runtime/parsed_options_test.cc b/runtime/parsed_options_test.cc
index f68b632..79dc2fa 100644
--- a/runtime/parsed_options_test.cc
+++ b/runtime/parsed_options_test.cc
@@ -22,7 +22,12 @@
 
 namespace art {
 
-class ParsedOptionsTest : public ::testing::Test {};
+class ParsedOptionsTest : public ::testing::Test {
+ public:
+  static void SetUpTestCase() {
+    CommonRuntimeTest::SetUpAndroidRoot();
+  }
+};
 
 TEST_F(ParsedOptionsTest, ParsedOptions) {
   void* test_vfprintf = reinterpret_cast<void*>(0xa);