Use std::string instead of WTF::String / TextStream

cc/stubs/TextStream.h

Index: cc/stubs/TextStream.h
diff --git a/cc/stubs/TextStream.h b/cc/stubs/TextStream.h
deleted file mode 100644
index 8ed4fbbd95202fb89e30528ccdb25fced10fc33b..0000000000000000000000000000000000000000
--- a/cc/stubs/TextStream.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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 CC_STUBS_TEXTSTREAM_H_
-#define CC_STUBS_TEXTSTREAM_H_
-
-#include <wtf/text/WTFString.h>
-
-namespace WebCore {
-
-// These symbols are all defined inside WebCore.
-class TextStream {
-public:
-    TextStream& operator<<(const String&);
-    TextStream& operator<<(const char*);
-    TextStream& operator<<(int);
-    String release();
-};
-
-}
-
-#endif  // CC_STUBS_TEXTSTREAM_H_
-