Use smart pointers for class owned pointers under xfa/fde

Use smart pointer to replace raw pointer type for class
owned member variables so that memory management will
be easier.

BUG=pdfium:518

Review-Url: https://codereview.chromium.org/2208423002

2 files changed, 18 insertions, 13 deletions

diff --git a/xfa/fgas/crt/fgas_memory.cpp b/xfa/fgas/crt/fgas_memory.cpp
index d218f42aa4..e587f5a5b0 100644
--- a/xfa/fgas/crt/fgas_memory.cpp
+++ b/xfa/fgas/crt/fgas_memory.cpp
@@ -27,10 +27,11 @@ class CFX_DefStore : public IFX_MemoryAllocator, public CFX_Target {
 
 }  // namespace
 
-IFX_MemoryAllocator* IFX_MemoryAllocator::Create(FX_ALLOCTYPE eType,
-                                                 size_t chunkSize,
-                                                 size_t blockSize) {
-  return new CFX_DefStore();
+std::unique_ptr<IFX_MemoryAllocator> IFX_MemoryAllocator::Create(
+    FX_ALLOCTYPE eType,
+    size_t chunkSize,
+    size_t blockSize) {
+  return std::unique_ptr<IFX_MemoryAllocator>(new CFX_DefStore());
 }
 
 #else  // MEMORY_TOOL_REPLACES_ALLOCATOR
@@ -88,17 +89,19 @@ class CFX_FixedStore : public IFX_MemoryAllocator, public CFX_Target {
 
 #define FX_4BYTEALIGN(size) (((size) + 3) & ~3)
 
-IFX_MemoryAllocator* IFX_MemoryAllocator::Create(FX_ALLOCTYPE eType,
-                                                 size_t chunkSize,
-                                                 size_t blockSize) {
+std::unique_ptr<IFX_MemoryAllocator> IFX_MemoryAllocator::Create(
+    FX_ALLOCTYPE eType,
+    size_t chunkSize,
+    size_t blockSize) {
   switch (eType) {
     case FX_ALLOCTYPE_Static:
-      return new CFX_StaticStore(chunkSize);
+      return std::unique_ptr<IFX_MemoryAllocator>(
+          new CFX_StaticStore(chunkSize));
     case FX_ALLOCTYPE_Fixed:
-      return new CFX_FixedStore(blockSize, chunkSize);
+      return std::unique_ptr<IFX_MemoryAllocator>(new CFX_FixedStore(blockSize, chunkSize);
     default:
       ASSERT(0);
-      return nullptr;
+      return std::unique_ptr<IFX_MemoryAllocator>();
   }
 }
 
diff --git a/xfa/fgas/crt/fgas_memory.h b/xfa/fgas/crt/fgas_memory.h
index a83933c7a5..1034c417d7 100644
--- a/xfa/fgas/crt/fgas_memory.h
+++ b/xfa/fgas/crt/fgas_memory.h
@@ -7,6 +7,8 @@
 #ifndef XFA_FGAS_CRT_FGAS_MEMORY_H_
 #define XFA_FGAS_CRT_FGAS_MEMORY_H_
 
+#include <memory>
+
 #include "core/fxcrt/include/fx_memory.h"
 #include "core/fxcrt/include/fx_system.h"
 
@@ -21,9 +23,9 @@ class IFX_MemoryAllocator {
   virtual void* Alloc(size_t size) = 0;
   virtual void Free(void* pBlock) = 0;
 
-  static IFX_MemoryAllocator* Create(FX_ALLOCTYPE eType,
-                                     size_t chunkSize,
-                                     size_t blockSize);
+  static std::unique_ptr<IFX_MemoryAllocator> Create(FX_ALLOCTYPE eType,
+                                                     size_t chunkSize,
+                                                     size_t blockSize);
 };
 
 class CFX_Target {