Minor fix to VkWrapTest

We need to make sure we cleanup the VkImage created when testing the
wrapping of a render target.

BUG=skia:

Change-Id: I60ea7e880fecccca309a250cc3b19eb29d6aa89c
Reviewed-on: https://skia-review.googlesource.com/10206
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tests/VkWrapTests.cpp b/tests/VkWrapTests.cpp
index 7de3160..9279ef6 100644
--- a/tests/VkWrapTests.cpp
+++ b/tests/VkWrapTests.cpp
@@ -100,7 +100,9 @@
     rt = gpu->wrapBackendRenderTarget(desc);
     REPORTER_ASSERT(reporter, rt);
 
-    gpu->deleteTestingOnlyBackendTexture(backendObj, true);
+    // When we wrapBackendRenderTarget it is always borrowed, so we must make sure to free the
+    // resource when we're done.
+    gpu->deleteTestingOnlyBackendTexture(backendObj, false);
 }
 
 void wrap_trt_test(skiatest::Reporter* reporter, GrContext* context) {