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

components/variations/net/variations_http_headers_unittest.cc

 // Copyright 2014 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 "components/variations/net/variations_http_headers.h"
 
+#include <stddef.h>
+
 #include "base/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 namespace variations {
 
 TEST(VariationsHttpHeadersTest, ShouldAppendHeaders) {
   struct {
     const char* url;
     bool should_append_headers;
@@ skipping 85 matching lines @@
 
   for (size_t i = 0; i < arraysize(cases); ++i) {
     const GURL url(cases[i].url);
     EXPECT_EQ(cases[i].should_append_headers,
               internal::ShouldAppendVariationHeaders(url))
         << url;
   }
 }
 
 }  // namespace variations