Fix "unreachable code" warnings (MSVC warning 4702) in content/.

content/common/indexed_db/indexed_db_key.cc

 // Copyright (c) 2012 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 "content/common/indexed_db/indexed_db_key.h"
 
 #include <string>
 #include "base/logging.h"
 
 namespace content {
@@ skipping 121 matching lines @@
       return (date_ < other.date_) ? -1 : (date_ > other.date_) ? 1 : 0;
     case WebIDBKeyTypeNumber:
       return (number_ < other.number_) ? -1 : (number_ > other.number_) ? 1 : 0;
     case WebIDBKeyTypeInvalid:
     case WebIDBKeyTypeNull:
     case WebIDBKeyTypeMin:
     default:
       NOTREACHED();
       return 0;
   }
-  NOTREACHED();
-  return 0;
 }
 
 bool IndexedDBKey::IsLessThan(const IndexedDBKey& other) const {
   return Compare(other) < 0;
 }
 
 bool IndexedDBKey::IsEqual(const IndexedDBKey& other) const {
   return !Compare(other);
 }
 
 bool IndexedDBKey::IsValid() const {
   if (type_ == WebIDBKeyTypeInvalid || type_ == WebIDBKeyTypeNull)
     return false;
 
   if (type_ == WebIDBKeyTypeArray) {
     for (size_t i = 0; i < array_.size(); i++) {
       if (!array_[i].IsValid())
         return false;
     }
   }
 
   return true;
 }
 
 }  // namespace content