switch to using android-base/file.h instead of android-base/test_utils.h

Test: compile
Bug: 119313545
Change-Id: I4f7ad84743e974b4b4d1d7256088f6c8b749a237
diff --git a/libunwindstack/tests/DexFileTest.cpp b/libunwindstack/tests/DexFileTest.cpp
index 40f9f8e..95d2176 100644
--- a/libunwindstack/tests/DexFileTest.cpp
+++ b/libunwindstack/tests/DexFileTest.cpp
@@ -20,7 +20,7 @@
 
 #include <unordered_map>
 
-#include <android-base/test_utils.h>
+#include <android-base/file.h>
 
 #include <unwindstack/MapInfo.h>
 #include <unwindstack/Memory.h>