Avoid the ptr.reset(new XXX()) anti-pattern

fpdfsdk/fpdfdoc_unittest.cpp

Index: fpdfsdk/fpdfdoc_unittest.cpp
diff --git a/fpdfsdk/fpdfdoc_unittest.cpp b/fpdfsdk/fpdfdoc_unittest.cpp
index 664ce393813b9e57ebca1ce0e9a64d367bac3abc..c63d6c2e77fa825130619bdb6eea9075fa3073b0 100644
--- a/fpdfsdk/fpdfdoc_unittest.cpp
+++ b/fpdfsdk/fpdfdoc_unittest.cpp
@@ -65,8 +65,9 @@ class PDFDocTest : public testing::Test {
 
     m_pDoc = pdfium::MakeUnique<CPDF_TestPdfDocument>();
     m_pIndirectObjs = m_pDoc->GetHolder();
+
     // Setup the root directory.
-    m_pRootObj.reset(new CPDF_Dictionary());
+    m_pRootObj = pdfium::MakeUnique<CPDF_Dictionary>();
     m_pDoc->SetRoot(m_pRootObj.get());
   }