Remove wtf::String::characterAt.

third_party/WebKit/Source/core/editing/GranularityStrategyTest.cpp

 // Copyright 2014 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 "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Text.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
@@ skipping 108 matching lines @@
 
 void GranularityStrategyTest::parseText(const TextNodeVector& textNodes)
 {
     bool wordStarted = false;
     int wordStartIndex = 0;
     for (auto& text : textNodes) {
         int wordStartIndexOffset = m_letterPos.size();
         String str = text->wholeText();
         for (size_t i = 0; i < str.length(); i++) {
             m_letterPos.append(visiblePositionToContentsPoint(createVisiblePosition(Position(text, i))));
-            char c = str.characterAt(i);
+            char c = str[i];
             if (isASCIIAlphanumeric(c) && !wordStarted) {
                 wordStartIndex = i + wordStartIndexOffset;
                 wordStarted = true;
             } else if (!isASCIIAlphanumeric(c) && wordStarted) {
                 IntPoint wordMiddle((m_letterPos[wordStartIndex].x() + m_letterPos[i + wordStartIndexOffset].x()) / 2, m_letterPos[wordStartIndex].y());
                 m_wordMiddles.append(wordMiddle);
                 wordStarted = false;
             }
         }
     }
@@ skipping 513 matching lines @@
 
     // "ab cd efghijkl ^mnopqr |>stuvwi inm," (^ means base and | means extent,
     // > means end).
     selection().setSelection(VisibleSelection(Position(text, 15), Position(text, 22)));
     EXPECT_EQ_SELECTED_TEXT("mnopqr ");
     selection().moveRangeSelectionExtent(m_wordMiddles[4]);
     EXPECT_EQ_SELECTED_TEXT("mnopqr iiin");
 }
 
 } // namespace blink