Switch to standard integer types in ui/.

ui/accessibility/ax_text_utils_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 "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/accessibility/ax_text_utils.h"
 
 namespace ui {
 
 TEST(AXTextUtils, FindAccessibleTextBoundaryLine) {
   const base::string16 text = base::UTF8ToUTF16("Line 1.\nLine 2\n\t");
   const size_t text_length = text.length();
   std::vector<int> line_start_offsets;
@@ skipping 45 matching lines @@
   EXPECT_EQ(0UL, result);
 
   // When we are at the start of the last line and we are searching forwards.
   // it should return the text length.
   result = FindAccessibleTextBoundary(text, line_start_offsets, LINE_BOUNDARY,
                                       15, FORWARDS_DIRECTION);
   EXPECT_EQ(text_length, result);
 }
 
 } // Namespace ui.