Switch to standard integer types in ios/.

ios/web/string_util_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 "ios/web/public/string_util.h"
 
+#include <stddef.h>
+
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace web {
 
 // Tests that a regular sentence is clipped correctly.
 TEST(StringByClippingLastWordTest, ClipRegularSentence) {
   const base::string16 kInput =
       base::UTF8ToUTF16("\nSome text here and there.");
   EXPECT_EQ(kInput, GetStringByClippingLastWord(kInput, 100));
@@ skipping 19 matching lines @@
   // A string slightly longer than |kLongStringLength|.
   base::string16 long_string(kLongStringLength + 10, 'a');
   // Block of text with no space should be truncated to kLongStringLength.
   base::string16 result =
       GetStringByClippingLastWord(long_string, kLongStringLength);
   EXPECT_EQ(kLongStringLength, result.size());
   EXPECT_EQ(0u, long_string.find_first_of(result));
 }
 
 }  // namespace web