Use smart pointers for class owned pointers in xfa/fxbarcode

For classes under xfa/fxbarcode, use smart pointers instead
of raw pointer to make memory management easier.

Also fix some styling issues along the changes.

BUG=pdfium:518

Review-Url: https://codereview.chromium.org/2221023003
diff --git a/xfa/fxbarcode/qrcode/BC_QRCodeWriter.cpp b/xfa/fxbarcode/qrcode/BC_QRCodeWriter.cpp
index c9f16ca..b2b87bc 100644
--- a/xfa/fxbarcode/qrcode/BC_QRCodeWriter.cpp
+++ b/xfa/fxbarcode/qrcode/BC_QRCodeWriter.cpp
@@ -35,16 +35,19 @@
   m_iCorrectLevel = 1;
   m_iVersion = 0;
 }
+
 CBC_QRCodeWriter::~CBC_QRCodeWriter() {}
+
 void CBC_QRCodeWriter::ReleaseAll() {
-  delete CBC_ReedSolomonGF256::QRCodeFild;
-  CBC_ReedSolomonGF256::QRCodeFild = nullptr;
+  delete CBC_ReedSolomonGF256::QRCodeField;
+  CBC_ReedSolomonGF256::QRCodeField = nullptr;
   delete CBC_ReedSolomonGF256::DataMatrixField;
   CBC_ReedSolomonGF256::DataMatrixField = nullptr;
   CBC_QRCoderMode::Destroy();
   CBC_QRCoderErrorCorrectionLevel::Destroy();
   CBC_QRCoderVersion::Destroy();
 }
+
 FX_BOOL CBC_QRCodeWriter::SetVersion(int32_t version) {
   if (version < 0 || version > 40) {
     return FALSE;
@@ -52,6 +55,7 @@
   m_iVersion = version;
   return TRUE;
 }
+
 FX_BOOL CBC_QRCodeWriter::SetErrorCorrectionLevel(int32_t level) {
   if (level < 0 || level > 3) {
     return FALSE;
@@ -59,6 +63,7 @@
   m_iCorrectLevel = level;
   return TRUE;
 }
+
 uint8_t* CBC_QRCodeWriter::Encode(const CFX_WideString& contents,
                                   int32_t ecLevel,
                                   int32_t& outWidth,
@@ -97,6 +102,7 @@
   FXSYS_memcpy(result, qr.GetMatrix()->GetArray(), outWidth * outHeight);
   return result;
 }
+
 uint8_t* CBC_QRCodeWriter::Encode(const CFX_ByteString& contents,
                                   BCFORMAT format,
                                   int32_t& outWidth,
@@ -105,6 +111,7 @@
                                   int32_t& e) {
   return nullptr;
 }
+
 uint8_t* CBC_QRCodeWriter::Encode(const CFX_ByteString& contents,
                                   BCFORMAT format,
                                   int32_t& outWidth,