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

chrome/common/extensions/command.cc

Index: chrome/common/extensions/command.cc
diff --git a/chrome/common/extensions/command.cc b/chrome/common/extensions/command.cc
index f2290dca4def611d4827ec80de5ac90ec64bd843..2eb3bd7fa0f3ffb0f2a60b05b3c56d4a93319274 100644
--- a/chrome/common/extensions/command.cc
+++ b/chrome/common/extensions/command.cc
@@ -194,11 +194,9 @@ ui::Accelerator ParseImpl(const std::string& accelerator,
       } else if (tokens[i] == values::kKeyMediaStop &&
                  should_parse_media_keys) {
         key = ui::VKEY_MEDIA_STOP;
-      } else if (tokens[i].size() == 1 &&
-                 tokens[i][0] >= 'A' && tokens[i][0] <= 'Z') {
+      } else if (tokens[i].size() == 1 && base::IsAsciiUpper(tokens[i][0])) {
         key = static_cast<ui::KeyboardCode>(ui::VKEY_A + (tokens[i][0] - 'A'));
-      } else if (tokens[i].size() == 1 &&
-                 tokens[i][0] >= '0' && tokens[i][0] <= '9') {
+      } else if (tokens[i].size() == 1 && base::IsAsciiDigit(tokens[i][0])) {
         key = static_cast<ui::KeyboardCode>(ui::VKEY_0 + (tokens[i][0] - '0'));
       } else {
         key = ui::VKEY_UNKNOWN;