Switch to standard integer types in tools/.

tools/gn/c_include_iterator_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 <stddef.h>
+
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/c_include_iterator.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/location.h"
 
 namespace {
 
 bool RangeIs(const LocationRange& range,
              int line, int begin_char, int end_char) {
   return range.begin().line_number() == line &&
@@ skipping 133 matching lines @@
   InputFile file(SourceFile("//foo.cc"));
   file.SetContents(buffer);
 
   base::StringPiece contents;
   LocationRange range;
 
   CIncludeIterator iter(&file);
   EXPECT_TRUE(iter.GetNextIncludeString(&contents, &range));
   EXPECT_EQ("foo/bar.h", contents);
 }