Replace CSSParserString with StringView.

third_party/WebKit/Source/wtf/text/StringView.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 "wtf/text/StringView.h"
 
 namespace WTF {
 
 StringView::StringView(const UChar* chars, unsigned length)
     : m_length(length)
@@ skipping 14 matching lines @@
 #endif
 
 String StringView::toString() const
 {
     if (isNull())
         return String();
     if (isEmpty())
         return emptyString();
     if (is8Bit())
         return String(m_data.characters8, m_length);
-    return String(m_data.characters16, m_length);
+    return StringImpl::create8BitIfPossible(m_data.characters16, m_length);
 }
 
 bool equalStringView(const StringView& a, const StringView& b)
 {
+    if (a.isNull() || b.isNull())
+        return a.isNull() == b.isNull();
     if (a.length() != b.length())
         return false;
-    if (a.isEmpty() || b.isEmpty())
-        return a.isEmpty() == b.isEmpty();
     if (a.is8Bit()) {
         if (b.is8Bit())
             return equal(a.characters8(), b.characters8(), a.length());
         return equal(a.characters8(), b.characters16(), a.length());
     }
     if (b.is8Bit())
         return equal(a.characters16(), b.characters8(), a.length());
     return equal(a.characters16(), b.characters16(), a.length());
 }
 
+bool equalIgnoringASCIICase(const StringView& a, const StringView& b)
+{
+    if (a.isNull() || b.isNull())
+        return a.isNull() == b.isNull();
+    if (a.length() != b.length())
+        return false;
+    if (a.is8Bit()) {
+        if (b.is8Bit())
+            return equalIgnoringASCIICase(a.characters8(), b.characters8(), a.length());
+        return equalIgnoringASCIICase(a.characters8(), b.characters16(), a.length());
+    }
+    if (b.is8Bit())
+        return equalIgnoringASCIICase(a.characters16(), b.characters8(), a.length());
+    return equalIgnoringASCIICase(a.characters16(), b.characters16(), a.length());
+}
+
 } // namespace WTF