Make valgrind happy; just a test bug.

Change-Id: Ia9217517551546f3de695733adf33d1592bec0f2
diff --git a/src/common_test.h b/src/common_test.h
index b3fafe4..0456c35 100644
--- a/src/common_test.h
+++ b/src/common_test.h
@@ -222,7 +222,7 @@
     int mkdir_result = mkdir(art_cache_.c_str(), 0700);
     ASSERT_EQ(mkdir_result, 0);
 
-    java_lang_dex_file_.reset(GetLibCoreDex());
+    java_lang_dex_file_.reset(DexFile::Open(GetLibCoreDexFileName(), ""));
 
     std::string boot_class_path;
     boot_class_path += "-Xbootclasspath:";
@@ -320,11 +320,6 @@
     return std::string("/system/framework/core.jar");
   }
 
-  const DexFile* GetLibCoreDex() {
-    std::string libcore_dex_file_name(GetLibCoreDexFileName());
-    return DexFile::Open(libcore_dex_file_name, "");
-  }
-
   const DexFile* OpenTestDexFile(const char* name) {
     CHECK(name != NULL);
     std::string filename;