Fix unintentional switch case fallthrough.

ui/base/accessibility/accessible_text_utils.cc

Index: ui/base/accessibility/accessible_text_utils.cc
diff --git a/ui/base/accessibility/accessible_text_utils.cc b/ui/base/accessibility/accessible_text_utils.cc
index 5fab22e120aa202123ee4d6b0654ec9280154cc3..a878b23d476ece84eac452805201e61e0073ff29 100644
--- a/ui/base/accessibility/accessible_text_utils.cc
+++ b/ui/base/accessibility/accessible_text_utils.cc
@@ -69,11 +69,13 @@ size_t FindAccessibleTextBoundary(const base::string16& text,
       case PARAGRAPH_BOUNDARY:
         if (text[pos] == '\n')
           return result;
+        break;
       case SENTENCE_BOUNDARY:
         if ((text[pos] == '.' || text[pos] == '!' || text[pos] == '?') &&
             (pos == text_size - 1 || IsWhitespace(text[pos + 1]))) {
           return result;
         }
+        break;
       case ALL_BOUNDARY:
       default:
         break;