Move operator<< for StringPiece into string_piece.{h,cc}

base/logging.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 #pragma once
 
 #include <cassert>
 #include <string>
 #include <cstring>
@@ skipping 962 matching lines @@
 #define NOTIMPLEMENTED() NOTREACHED()
 #elif NOTIMPLEMENTED_POLICY == 4
 #define NOTIMPLEMENTED() LOG(ERROR) << NOTIMPLEMENTED_MSG
 #elif NOTIMPLEMENTED_POLICY == 5
 #define NOTIMPLEMENTED() do {\
   static int count = 0;\
   LOG_IF(ERROR, 0 == count++) << NOTIMPLEMENTED_MSG;\
 } while(0)
 #endif
 
-namespace base {
-
-template <typename STRING_TYPE> class BasicStringPiece;
-typedef BasicStringPiece<std::string> StringPiece;
-
-// Allows StringPiece to be logged.
-BASE_EXPORT std::ostream& operator<<(std::ostream& o, const StringPiece& piece);
-
-}  // namespace base
-
 #endif  // BASE_LOGGING_H_