Use smart pointers for graphics device classes

core/fxge/apple/fx_quartz_device.cpp

Index: core/fxge/apple/fx_quartz_device.cpp
diff --git a/core/fxge/apple/fx_quartz_device.cpp b/core/fxge/apple/fx_quartz_device.cpp
index b3591a3da132eed48b8d6cacee31b3c686bc3c42..0f3832e73357cc878a2825bb90ef2f7f2e19d092 100644
--- a/core/fxge/apple/fx_quartz_device.cpp
+++ b/core/fxge/apple/fx_quartz_device.cpp
@@ -1023,6 +1023,7 @@ FX_BOOL CFX_QuartzDevice::Attach(CGContextRef context, int32_t nDeviceClass) {
   SetDeviceDriver(pDriver);
   return TRUE;
 }
+
 FX_BOOL CFX_QuartzDevice::Attach(CFX_DIBitmap* pBitmap) {
   SetBitmap(pBitmap);
   m_pContext = createContextWithBitmap(pBitmap);
@@ -1034,18 +1035,17 @@ FX_BOOL CFX_QuartzDevice::Attach(CFX_DIBitmap* pBitmap) {
   SetDeviceDriver(pDriver);
   return TRUE;
 }
+
 FX_BOOL CFX_QuartzDevice::Create(int32_t width,
                                  int32_t height,
                                  FXDIB_Format format) {
   if ((uint8_t)format < 32) {
     return FALSE;
   }
-  CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
-  if (!pBitmap->Create(width, height, format)) {
-    delete pBitmap;
+  std::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
+  if (!pBitmap->Create(width, height, format))
     return FALSE;
-  }
   m_bOwnedBitmap = TRUE;
-  return Attach(pBitmap);
+  return Attach(pBitmap.release());
 }
 #endif  // _FXM_PLATFORM_  == _FXM_PLATFORM_APPLE_