Move more string_util functions to base namespace.

ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc

Index: ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc
diff --git a/ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc b/ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc
index dd329dcd9549358a3e35fcd07188a015a0fc6caa..72c16beab21f8171b5e4b920ff653ab641078d05 100644
--- a/ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc
+++ b/ui/events/ozone/evdev/libgestures_glue/gesture_feedback.cc
@@ -100,7 +100,7 @@ std::string GetCurrentTimeForLogging() {
 std::string GetCanonicalDeviceName(const std::string& name) {
   std::string ret(name);
   for (size_t i = 0; i < ret.size(); ++i)
-    if (!IsAsciiAlpha(ret[i]))
+    if (!base::IsAsciiAlpha(ret[i]))
       ret[i] = '_';
   return ret;
 }