Revert of Expand WTF::StringView's API to be more like StringPiece.

third_party/WebKit/Source/core/testing/MockHyphenation.cpp

 // Copyright 2016 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 "core/testing/MockHyphenation.h"
 
 namespace blink {
 
 size_t MockHyphenation::lastHyphenLocation(const StringView& text,
     size_t beforeIndex) const
 {
-    String str = text.toString();
-    if (str.endsWith("phenation", TextCaseASCIIInsensitive)) {
-        if (beforeIndex - (str.length() - 9) > 4)
-            return 4 + (str.length() - 9);
-        if (str.endsWith("hyphenation", TextCaseASCIIInsensitive)
-            && beforeIndex - (str.length() - 11) > 2) {
-            return 2 + (str.length() - 11);
+    RefPtr<StringImpl> str = text.toString();
+    if (str->endsWithIgnoringASCIICase("phenation", 9)) {
+        if (beforeIndex - (str->length() - 9) > 4)
+            return 4 + (str->length() - 9);
+        if (str->endsWithIgnoringASCIICase("hyphenation", 11)
+            && beforeIndex - (str->length() - 11) > 2) {
+            return 2 + (str->length() - 11);
         }
     }
     return 0;
 }
 
 } // namespace blink