Uses and returns the fractional width in text eliding

ui/gfx/platform_font_ios.mm

Index: ui/gfx/platform_font_ios.mm
diff --git a/ui/gfx/platform_font_ios.mm b/ui/gfx/platform_font_ios.mm
index 92608d322c0ec46295a393aef085e4e2ac79785f..6ce88121cacd564f413996ad61c636132acb1668 100644
--- a/ui/gfx/platform_font_ios.mm
+++ b/ui/gfx/platform_font_ios.mm
@@ -55,16 +55,16 @@ int PlatformFontIOS::GetCapHeight() const {
   return cap_height_;
 }
 
-int PlatformFontIOS::GetAverageCharacterWidth() const {
+float PlatformFontIOS::GetAverageCharacterWidth() const {
   return average_width_;
 }
 
-int PlatformFontIOS::GetStringWidth(const base::string16& text) const {
+float PlatformFontIOS::GetStringWidth(const base::string16& text) const {
   NSString* ns_text = base::SysUTF16ToNSString(text);
   return [ns_text sizeWithFont:GetNativeFont()].width;
 }
 
-int PlatformFontIOS::GetExpectedTextWidth(int length) const {
+float PlatformFontIOS::GetExpectedTextWidth(int length) const {
   return length * average_width_;
 }