Implement IsAsciiUpper and IsAsciiLower in base/strings/string_util.h

ui/base/accelerators/accelerator.cc

Index: ui/base/accelerators/accelerator.cc
diff --git a/ui/base/accelerators/accelerator.cc b/ui/base/accelerators/accelerator.cc
index fa166bdf00915300a5979fe8c93192b5fb548357..4f6ad4b1598ba08f2b2193168ee9dab11ab167ec 100644
--- a/ui/base/accelerators/accelerator.cc
+++ b/ui/base/accelerators/accelerator.cc
@@ -214,7 +214,7 @@ base::string16 Accelerator::GetShortcutText() const {
     // accent' for '0'). For display in the menu (e.g. Ctrl-0 for the
     // default zoom level), we leave VK_[0-9] alone without translation.
     wchar_t key;
-    if (key_code_ >= '0' && key_code_ <= '9')
+    if (base::IsAsciiDigit(key_code_))
       key = static_cast<wchar_t>(key_code_);
     else
       key = LOWORD(::MapVirtualKeyW(key_code_, MAPVK_VK_TO_CHAR));