Add ptr_util.h from base until std::make_unique<> available

core/fxge/dib/fx_dib_transform.cpp

Index: core/fxge/dib/fx_dib_transform.cpp
diff --git a/core/fxge/dib/fx_dib_transform.cpp b/core/fxge/dib/fx_dib_transform.cpp
index a559fee55d3c9d7223bd7d452bbfe517267083bc..559c6e2a3849d90b6a16b7632dc25cdc570f8470 100644
--- a/core/fxge/dib/fx_dib_transform.cpp
+++ b/core/fxge/dib/fx_dib_transform.cpp
@@ -7,6 +7,7 @@
 #include "core/fxge/dib/dib_int.h"
 
 #include "core/fxge/fx_dib.h"
+#include "third_party/base/ptr_util.h"
 
 namespace {
 
@@ -363,8 +364,8 @@ FX_BOOL CFX_ImageTransformer::Start() {
     result_clip.Offset(-result_rect.left, -result_rect.top);
     result_clip = FXDIB_SwapClipBox(result_clip, dest_width, dest_height,
                                     m_pMatrix->c > 0, m_pMatrix->b < 0);
-    m_Stretcher = WrapUnique(new CFX_ImageStretcher(
-        &m_Storer, m_pSrc, dest_height, dest_width, result_clip, m_Flags));
+    m_Stretcher = pdfium::MakeUnique<CFX_ImageStretcher>(
+        &m_Storer, m_pSrc, dest_height, dest_width, result_clip, m_Flags);
     m_Stretcher->Start();
     m_Status = 1;
     return TRUE;
@@ -376,8 +377,8 @@ FX_BOOL CFX_ImageTransformer::Start() {
     int dest_height = m_pMatrix->d > 0 ? (int)-FXSYS_ceil(m_pMatrix->d)
                                        : (int)-FXSYS_floor(m_pMatrix->d);
     result_clip.Offset(-result_rect.left, -result_rect.top);
-    m_Stretcher = WrapUnique(new CFX_ImageStretcher(
-        &m_Storer, m_pSrc, dest_width, dest_height, result_clip, m_Flags));
+    m_Stretcher = pdfium::MakeUnique<CFX_ImageStretcher>(
+        &m_Storer, m_pSrc, dest_width, dest_height, result_clip, m_Flags);
     m_Stretcher->Start();
     m_Status = 2;
     return TRUE;
@@ -395,9 +396,8 @@ FX_BOOL CFX_ImageTransformer::Start() {
   clip_rect_f.Transform(&m_dest2stretch);
   m_StretchClip = clip_rect_f.GetOuterRect();
   m_StretchClip.Intersect(0, 0, stretch_width, stretch_height);
-  m_Stretcher = WrapUnique(new CFX_ImageStretcher(&m_Storer, m_pSrc,
-                                                  stretch_width, stretch_height,
-                                                  m_StretchClip, m_Flags));
+  m_Stretcher = pdfium::MakeUnique<CFX_ImageStretcher>(
+      &m_Storer, m_pSrc, stretch_width, stretch_height, m_StretchClip, m_Flags);
   m_Stretcher->Start();
   m_Status = 3;
   return TRUE;