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

xfa/fxgraphics/cfx_graphics.cpp

Index: xfa/fxgraphics/cfx_graphics.cpp
diff --git a/xfa/fxgraphics/cfx_graphics.cpp b/xfa/fxgraphics/cfx_graphics.cpp
index 824e7c68da85597600f15534bfe862aac0c94458..5b3bc8cb9de40d2e0c19727abb07f13ee17f4428 100644
--- a/xfa/fxgraphics/cfx_graphics.cpp
+++ b/xfa/fxgraphics/cfx_graphics.cpp
@@ -12,6 +12,7 @@
 #include "core/fxge/cfx_gemodule.h"
 #include "core/fxge/cfx_renderdevice.h"
 #include "core/fxge/cfx_unicodeencoding.h"
+#include "third_party/base/ptr_util.h"
 #include "xfa/fxgraphics/cagg_graphics.h"
 #include "xfa/fxgraphics/cfx_color.h"
 #include "xfa/fxgraphics/cfx_path.h"
@@ -597,7 +598,7 @@ FWL_Error CFX_Graphics::Create(int32_t width,
 
   m_type = FX_CONTEXT_Device;
   m_info.isAntialiasing = isAntialiasing;
-  m_aggGraphics.reset(new CAGG_Graphics);
+  m_aggGraphics = pdfium::MakeUnique<CAGG_Graphics>();
   return m_aggGraphics->Create(this, width, height, format);
 }