Use container::back() and container::pop_back() in ui/

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

Index: ui/events/ozone/evdev/libgestures_glue/gesture_property_provider.cc
diff --git a/ui/events/ozone/evdev/libgestures_glue/gesture_property_provider.cc b/ui/events/ozone/evdev/libgestures_glue/gesture_property_provider.cc
index cde379153b64eb4c48f5599d39809f0ec5588cbb..c12564c41f8169f89289117a70610203079dc41c 100644
--- a/ui/events/ozone/evdev/libgestures_glue/gesture_property_provider.cc
+++ b/ui/events/ozone/evdev/libgestures_glue/gesture_property_provider.cc
@@ -1078,8 +1078,7 @@ void GesturePropertyProvider::ParseXorgConfFile(const std::string& content) {
         // one.
         if (is_parsing) {
           // Stop parsing the current line if the format is wrong.
-          if (piece.size() <= 2 || piece[0] != '\"' ||
-              piece[piece.size() - 1] != '\"') {
+          if (piece.size() <= 2 || piece[0] != '\"' || piece.back() != '\"') {
             LOG(ERROR) << "Error parsing line: " << lines.token();
             has_error = true;
             if (next_is_section_type)