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

chrome/renderer/extensions/chrome_v8_extension.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 CHROME_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_
 #pragma once
 
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
+#include "base/string_piece.h"
 #include "chrome/renderer/extensions/chrome_v8_extension_handler.h"
 #include "v8/include/v8.h"
 
 #include <map>
 #include <set>
 #include <string>
 
 class ChromeV8Context;
 class Extension;
 class ExtensionDispatcher;
@@ skipping 74 matching lines @@
 
   // Map of all current handlers.
   typedef std::map<ChromeV8Context*,
                    linked_ptr<ChromeV8ExtensionHandler> > HandlerMap;
   HandlerMap handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeV8Extension);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_