iwyu: Include stringprintf.h where appropriate, part 1.

base/i18n/number_formatting.cc

 // Copyright (c) 2011 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 "base/i18n/number_formatting.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "unicode/numfmt.h"
 #include "unicode/ustring.h"
 
 namespace base {
 
 namespace {
 
 struct NumberFormatWrapper {
@@ skipping 21 matching lines @@
     // As a fallback, just return the raw number in a string.
     return UTF8ToUTF16(StringPrintf("%" PRId64, number));
   }
   icu::UnicodeString ustr;
   number_format->format(number, ustr);
 
   return string16(ustr.getBuffer(), static_cast<size_t>(ustr.length()));
 }
 
 }  // namespace base