Move test utility functions to a common place.

src/platform/vboot_reference/utils/firmware_utility.cc

Index: src/platform/vboot_reference/utils/firmware_utility.cc
diff --git a/src/platform/vboot_reference/utils/firmware_utility.cc b/src/platform/vboot_reference/utils/firmware_utility.cc
index f5a4de8ee8089920a1f20413a8f6468daf7517ed..6b543f5220f2987a16c559969a552e491ef14d6d 100644
--- a/src/platform/vboot_reference/utils/firmware_utility.cc
+++ b/src/platform/vboot_reference/utils/firmware_utility.cc
@@ -226,8 +226,8 @@ bool FirmwareUtility::VerifySignedImage(void) {
     cerr << "Couldn't read firmware image or malformed image.\n";
     return false;
   }
-  if (!(error = VerifyFirmwareImage(root_key_pub_, image_,
-                                    0)))  // Trusted Mode.
+  if (VERIFY_FIRMWARE_SUCCESS ==
+      (error = VerifyFirmwareImage(root_key_pub_, image_)))
     return true;
   cerr << VerifyFirmwareErrorString(error) << "\n";
   return false;;