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

fpdfsdk/fpdfdoc_unittest.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "public/fpdf_doc.h"
 
 #include <memory>
 #include <vector>
 
 #include "core/fpdfapi/cpdf_modulemgr.h"
@@ skipping 47 matching lines @@
   };
 
   void SetUp() override {
     // We don't need page module or render module, but
     // initialize them to keep the code sane.
     CPDF_ModuleMgr* module_mgr = CPDF_ModuleMgr::Get();
     module_mgr->InitPageModule();
 
     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());
   }
 
   void TearDown() override {
     m_pRootObj.reset();
     m_pIndirectObjs = nullptr;
     m_pDoc.reset();
     CPDF_ModuleMgr::Destroy();
   }
 
@@ skipping 184 matching lines @@
   EXPECT_TRUE(FPDFDest_GetLocationInPage(array.get(), &hasX, &hasY, &hasZoom,
                                          &x, &y, &zoom));
   EXPECT_FALSE(hasX);
   EXPECT_FALSE(hasY);
   EXPECT_FALSE(hasZoom);
 
   array = pdfium::MakeUnique<CPDF_Array>();
   EXPECT_FALSE(FPDFDest_GetLocationInPage(array.get(), &hasX, &hasY, &hasZoom,
                                           &x, &y, &zoom));
 }