base: get rid of deprecated TrimWhitespace() function

ui/gfx/font_fallback_win.cc

Index: ui/gfx/font_fallback_win.cc
diff --git a/ui/gfx/font_fallback_win.cc b/ui/gfx/font_fallback_win.cc
index 1612f3c72194b4defe7396ff71572fe9971e6dc1..c578ba8be581701541a284f85399db892b0fe242 100644
--- a/ui/gfx/font_fallback_win.cc
+++ b/ui/gfx/font_fallback_win.cc
@@ -206,8 +206,8 @@ void ParseFontFamilyString(const std::string& family,
     const size_t index = font_names->back().find('(');
     if (index != std::string::npos) {
       font_names->back().resize(index);
-      base::TrimWhitespace(font_names->back(), base::TRIM_TRAILING,
-                           &font_names->back());
+      base::TrimWhitespaceASCII(font_names->back(), base::TRIM_TRAILING,
+                                &font_names->back());
     }
   }
 }