Switch to standard integer types in tools/.

tools/gn/runtime_deps_unittest.cc

 // Copyright 2015 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 <algorithm>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/runtime_deps.h"
 #include "tools/gn/target.h"
 #include "tools/gn/test_with_scope.h"
 
 namespace {
 
 void InitTargetWithType(TestWithScope& setup,
@@ skipping 258 matching lines @@
   target.data_deps().push_back(LabelTargetPair(&action));
   ASSERT_TRUE(target.OnResolved(&err));
 
   // The results should be the executable and the copy output.
   std::vector<std::pair<OutputFile, const Target*>> result =
       ComputeRuntimeDeps(&target);
   EXPECT_TRUE(std::find(result.begin(), result.end(),
                         MakePair("../../action.output", &action)) !=
               result.end()) << GetVectorDescription(result);
 }