Use more unique_ptrs in CPDF_Image.

core/fpdfapi/page/cpdf_clippath.cpp

Index: core/fpdfapi/page/cpdf_clippath.cpp
diff --git a/core/fpdfapi/page/cpdf_clippath.cpp b/core/fpdfapi/page/cpdf_clippath.cpp
index 465a1c7997a0d3d6a9e7f811f0caa85cc3f3ed67..cfcd9a1e643ca85624f6b433205342233a4ab02b 100644
--- a/core/fpdfapi/page/cpdf_clippath.cpp
+++ b/core/fpdfapi/page/cpdf_clippath.cpp
@@ -123,7 +123,7 @@ CPDF_ClipPath::PathData::PathData(const PathData& that) {
   m_TextList.resize(that.m_TextList.size());
   for (size_t i = 0; i < that.m_TextList.size(); ++i) {
     if (that.m_TextList[i])
-      m_TextList[i].reset(that.m_TextList[i]->Clone());
+      m_TextList[i] = that.m_TextList[i]->Clone();
   }
 }