Rewriting loop in accessibility code to silence analyzer.

ui/accessibility/ax_text_utils.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/ax_text_utils.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 
 namespace ui {
@@ skipping 13 matching lines @@
       return start_offset;
   } else if (boundary == LINE_BOUNDARY) {
     if (direction == FORWARDS_DIRECTION) {
       for (size_t j = 0; j < line_breaks.size(); ++j) {
           size_t line_break = line_breaks[j] >= 0 ? line_breaks[j] : 0;
         if (line_break > start_offset)
           return line_break;
       }
       return text_size;
     } else {
-      // Note: j is unsigned, so for loop continues until j wraps around
-      // and becomes greater than the starting value.
-      for (size_t j = line_breaks.size() - 1;
-           j < line_breaks.size();
-           --j) {
-        size_t line_break = line_breaks[j] >= 0 ? line_breaks[j] : 0;
+      for (size_t j = line_breaks.size(); j != 0; --j) {
+        size_t line_break = line_breaks[j - 1] >= 0 ? line_breaks[j - 1] : 0;
         if (line_break <= start_offset)
           return line_break;
       }
       return 0;
     }
   }
 
   size_t result = start_offset;
   for (;;) {
     size_t pos;
@@ skipping 33 matching lines @@
 
     if (direction == FORWARDS_DIRECTION) {
       result++;
     } else {
       result--;
     }
   }
 }
 
 }  // Namespace ui