Revert "Explicitly implement copy ctor/assignment operator for IndexedDBKey"

content/common/indexed_db/indexed_db_key.h

 // 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.
 
 #ifndef CONTENT_COMMON_INDEXED_DB_INDEXED_DB_KEY_H_
 #define CONTENT_COMMON_INDEXED_DB_INDEXED_DB_KEY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
  public:
   typedef std::vector<IndexedDBKey> KeyArray;
 
   IndexedDBKey();  // Defaults to blink::WebIDBKeyTypeInvalid.
   explicit IndexedDBKey(blink::WebIDBKeyType);  // must be Null or Invalid
   explicit IndexedDBKey(const KeyArray& array);
   explicit IndexedDBKey(const std::string& binary);
   explicit IndexedDBKey(const base::string16& string);
   IndexedDBKey(double number,
                blink::WebIDBKeyType type);  // must be date or number
-  IndexedDBKey(const IndexedDBKey& other);
   ~IndexedDBKey();
 
-  IndexedDBKey& operator=(const IndexedDBKey& other);
-
   bool IsValid() const;
 
   bool IsLessThan(const IndexedDBKey& other) const;
   bool Equals(const IndexedDBKey& other) const;
 
   blink::WebIDBKeyType type() const { return type_; }
   const std::vector<IndexedDBKey>& array() const { return array_; }
   const std::string& binary() const { return binary_; }
   const base::string16& string() const { return string_; }
   double date() const { return date_; }
@@ skipping 10 matching lines @@
   base::string16 string_;
   double date_;
   double number_;
 
   size_t size_estimate_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_INDEXED_DB_INDEXED_DB_KEY_H_