Revert of skstd -> std for unique_ptr

src/android/SkBitmapRegionDecoder.cpp

Index: src/android/SkBitmapRegionDecoder.cpp
diff --git a/src/android/SkBitmapRegionDecoder.cpp b/src/android/SkBitmapRegionDecoder.cpp
index 62cf846a2adea16b61fe1477b5ec63556fdd7721..7dc05059e1b76255f307cda621bc02a5d3856584 100644
--- a/src/android/SkBitmapRegionDecoder.cpp
+++ b/src/android/SkBitmapRegionDecoder.cpp
@@ -49,9 +49,9 @@
         case kAndroidCodec_Strategy: {
             SkAutoTDelete<SkAndroidCodec> codec =
                     SkAndroidCodec::NewFromStream(streamDeleter.detach());
-            if (!codec) {
+            if (NULL == codec) {
                 SkCodecPrintf("Error: Failed to create codec.\n");
-                return nullptr;
+                return NULL;
             }
             return new SkBitmapRegionCodec(codec.detach());
         }