Switch to standard integer types in components/, part 2 of 4.

components/json_schema/json_schema_validator_unittest.cc

 // Copyright 2013 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 <stddef.h>
+
 #include "base/values.h"
 #include "components/json_schema/json_schema_validator.h"
 #include "components/json_schema/json_schema_validator_unittest_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class JSONSchemaValidatorCPPTest : public JSONSchemaValidatorTestBase {
  public:
   JSONSchemaValidatorCPPTest() : JSONSchemaValidatorTestBase() {}
 
  protected:
@@ skipping 133 matching lines @@
       "  \"unknown attribute\": \"that should just be ignored\""
       "}",
       JSONSchemaValidator::OPTIONS_IGNORE_UNKNOWN_ATTRIBUTES,
       &error)) << error;
   EXPECT_FALSE(JSONSchemaValidator::IsValidSchema(
       "{"
       "  \"type\": \"object\","
       "  \"unknown attribute\": \"that will cause a failure\""
       "}", 0, &error)) << error;
 }