Change other usages of .size() to .empty() when applicable.

chrome/browser/chromeos/login/wizard_accessibility_handler.cc

Index: chrome/browser/chromeos/login/wizard_accessibility_handler.cc
diff --git a/chrome/browser/chromeos/login/wizard_accessibility_handler.cc b/chrome/browser/chromeos/login/wizard_accessibility_handler.cc
index 16bb99b6f778970ac4c319fa80c7a5a9e5ca143a..539b0bd762876c1106158f9faa747fe755040349 100644
--- a/chrome/browser/chromeos/login/wizard_accessibility_handler.cc
+++ b/chrome/browser/chromeos/login/wizard_accessibility_handler.cc
@@ -430,13 +430,13 @@ void WizardAccessibilityHandler::DescribeTextContentsChanged(
       new_indices[prefix_char_len],
       new_indices[new_suffix_char_start] - new_indices[prefix_char_len]);
 
-  if (inserted.size() > 0 && deleted.size() > 0) {
+  if (!inserted.empty() && !deleted.empty()) {
     // Replace one substring with another, speak inserted text.
     AppendUtterance(inserted, out_spoken_description);
-  } else if (inserted.size() > 0) {
+  } else if (!inserted.empty()) {
     // Speak inserted text.
     AppendUtterance(inserted, out_spoken_description);
-  } else if (deleted.size() > 0) {
+  } else if (!deleted.empty()) {
     // Speak deleted text.
     AppendUtterance(deleted, out_spoken_description);
   }