Do not silently drop \u0000 in base::JSONReader

base/json/json_reader_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/json/json_reader.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 222 matching lines @@
     ASSERT_TRUE(root);
     EXPECT_TRUE(root->IsType(Value::Type::STRING));
     std::string str_val;
     EXPECT_TRUE(root->GetAsString(&str_val));
     EXPECT_EQ(" \"\\/\b\f\n\r\t\v", str_val);
   }
 
   {
     // Test hex and unicode escapes including the null character.
     std::unique_ptr<Value> root =
-        JSONReader().ReadToValue("\"\\x41\\x00\\u1234\"");
+        JSONReader().ReadToValue("\"\\x41\\x00\\u1234\\u0000\"");
     ASSERT_TRUE(root);
     EXPECT_TRUE(root->IsType(Value::Type::STRING));
     std::string str_val;
     EXPECT_TRUE(root->GetAsString(&str_val));
-    EXPECT_EQ(std::wstring(L"A\0\x1234", 3), UTF8ToWide(str_val));
+    EXPECT_EQ(std::wstring(L"A\0\x1234\0", 4), UTF8ToWide(str_val));
   }
 
   {
     // Test invalid strings
     EXPECT_FALSE(JSONReader().ReadToValue("\"no closing quote"));
     EXPECT_FALSE(JSONReader().ReadToValue("\"\\z invalid escape char\""));
     EXPECT_FALSE(JSONReader().ReadToValue("\"\\xAQ invalid hex code\""));
     EXPECT_FALSE(JSONReader().ReadToValue("not enough hex chars\\x1\""));
     EXPECT_FALSE(JSONReader().ReadToValue("\"not enough escape chars\\u123\""));
     EXPECT_FALSE(
@@ skipping 410 matching lines @@
 
 TEST(JSONReaderTest, IllegalTrailingNull) {
   const char json[] = { '"', 'n', 'u', 'l', 'l', '"', '\0' };
   std::string json_string(json, sizeof(json));
   JSONReader reader;
   EXPECT_FALSE(reader.ReadToValue(json_string));
   EXPECT_EQ(JSONReader::JSON_UNEXPECTED_DATA_AFTER_ROOT, reader.error_code());
 }
 
 }  // namespace base