Un-DCHECK-guard ThreadRestrictionVerifier for strings.

third_party/WebKit/Source/wtf/ThreadRestrictionVerifier.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ThreadRestrictionVerifier_h
 #define ThreadRestrictionVerifier_h
 
 #include "wtf/Assertions.h"
 
-#if DCHECK_IS_ON()
+// TODO(meade): Revert this by 17 Mar 17.
+// This is for investigating crbug.com/694520
+// #if DCHECK_IS_ON()
 
 #include "wtf/Threading.h"
 
 namespace WTF {
 
 // Verifies that a class is used in a way that respects its lack of
 // thread-safety.  The default mode is to verify that the object will only be
 // used on a single thread. The thread gets captured when setShared(true) is
 // called.  The mode may be changed by calling useMutexMode (or
 // turnOffVerification).
@@ skipping 50 matching lines @@
     m_owningThread = currentThread();
   }
 
   bool m_shared;
 
   ThreadIdentifier m_owningThread;
 };
 
 }  // namespace WTF
 
-#endif  // DCHECK_IS_ON()
+// #endif  // DCHECK_IS_ON()
 #endif  // ThreadRestrictionVerifier_h