Allow StringView to have the sole reference to a static string

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"
 
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/StringImpl.h"
 #include "wtf/text/WTFString.h"
 
 namespace WTF {
 
 StringView::StringView(const UChar* chars)
     : StringView(chars, chars ? lengthOfNullTerminatedString(chars) : 0) {}
 
 #if DCHECK_IS_ON()
 StringView::~StringView() {
   DCHECK(m_impl);
-  DCHECK(!m_impl->hasOneRef()) << "StringView does not own the StringImpl, it "
-                                  "must not have the last ref.";
+  DCHECK(!m_impl->hasOneRef() || m_impl->isStatic())
+      << "StringView does not own the StringImpl, it "
+         "must not have the last ref.";
 }
 #endif
 
 String StringView::toString() const {
   if (isNull())
     return String();
   if (isEmpty())
     return emptyString();
   if (StringImpl* impl = sharedImpl())
     return impl;
@@ skipping 60 matching lines @@
     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