Fix some code which causes warnings when compiled by /analyze tool

core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp

Index: core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
diff --git a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
index 352e4ee15c8c1ebd8a111c89dde12b030548a25a..cd96c4a72af1ad7e46498c90d3ddf0e27ea214a4 100644
--- a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
+++ b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
@@ -29,7 +29,7 @@ TEST(fpdf_parser_decode, A85Decode) {
   for (size_t i = 0; i < FX_ArraySize(test_data); ++i) {
     pdfium::DecodeTestData* ptr = &test_data[i];
     uint8_t* result = nullptr;
-    uint32_t result_size;
+    uint32_t result_size = 0;
     EXPECT_EQ(ptr->processed_size,
               A85Decode(ptr->input, ptr->input_size, result, result_size))
         << "for case " << i;
@@ -64,7 +64,7 @@ TEST(fpdf_parser_decode, HexDecode) {
   for (size_t i = 0; i < FX_ArraySize(test_data); ++i) {
     pdfium::DecodeTestData* ptr = &test_data[i];
     uint8_t* result = nullptr;
-    uint32_t result_size;
+    uint32_t result_size = 0;
     EXPECT_EQ(ptr->processed_size,
               HexDecode(ptr->input, ptr->input_size, result, result_size))
         << "for case " << i;