Uses and returns the fractional width in text eliding

ui/gfx/text_utils_ios.mm

 // Copyright 2013 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 "ui/gfx/text_utils.h"
 
 #import <UIKit/UIKit.h>
 
-#include <cmath>
-
 #include "base/strings/sys_string_conversions.h"
 #include "ui/gfx/font_list.h"
 
 namespace gfx {
 
-int GetStringWidth(const base::string16& text, const FontList& font_list) {
+float GetStringWidth(const base::string16& text, const FontList& font_list) {
   NSString* ns_text = base::SysUTF16ToNSString(text);
   NativeFont native_font = font_list.GetPrimaryFont().GetNativeFont();
-  return std::ceil([ns_text sizeWithFont:native_font].width);
+  return [ns_text sizeWithFont:native_font].width;
 }
 
 }  // namespace gfx