Do not silently drop \u0000 in base::JSONReader

base/json/json_reader_unittest.cc

Index: base/json/json_reader_unittest.cc
diff --git a/base/json/json_reader_unittest.cc b/base/json/json_reader_unittest.cc
index 1b00b1d9e9166387975dd0a63e2f1d387658f3db..8e05cae78c51a259978ce52c6e82b970a9d253cb 100644
--- a/base/json/json_reader_unittest.cc
+++ b/base/json/json_reader_unittest.cc
@@ -240,12 +240,12 @@ TEST(JSONReaderTest, Reading) {
   {
     // 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));
   }
 
   {