Replace std::unique_ptr.reset() with WrapUnique assignment.

fpdfsdk/ edition.

Review-Url: https://codereview.chromium.org/2381723002
diff --git a/fpdfsdk/fpdfdoc_unittest.cpp b/fpdfsdk/fpdfdoc_unittest.cpp
index 7b185cc..7c757e4 100644
--- a/fpdfsdk/fpdfdoc_unittest.cpp
+++ b/fpdfsdk/fpdfdoc_unittest.cpp
@@ -61,7 +61,7 @@
     CPDF_ModuleMgr* module_mgr = CPDF_ModuleMgr::Get();
     module_mgr->InitPageModule();
 
-    m_pDoc.reset(new CPDF_TestPdfDocument());
+    m_pDoc = WrapUnique(new CPDF_TestPdfDocument());
     m_pIndirectObjs = m_pDoc->GetHolder();
     // Setup the root directory.
     m_pRootObj.reset(new CPDF_Dictionary(CFX_WeakPtr<CFX_ByteStringPool>()));