Fix logging of string16s from gfx namespace on Windows.

ui/gfx/selection_model.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 UI_GFX_SELECTION_MODEL_H_
 #define UI_GFX_SELECTION_MODEL_H_
 #pragma once
 
-#include <iosfwd>
+#include <string>
 
 #include "ui/base/range/range.h"
 #include "ui/base/ui_export.h"
 
 namespace gfx {
 
 // VisualCursorDirection and LogicalCursorDirection represent directions of
 // motion of the cursor in BiDi text. The combinations that make sense are:
 //
 //  base::i18n::TextDirection  VisualCursorDirection  LogicalCursorDirection
@@ skipping 50 matching lines @@
   // The caret position is the end of the range.
   SelectionModel(ui::Range selection, LogicalCursorDirection affinity);
 
   const ui::Range& selection() const { return selection_; }
   size_t caret_pos() const { return selection_.end(); }
   LogicalCursorDirection caret_affinity() const { return caret_affinity_; }
 
   bool operator==(const SelectionModel& sel) const;
   bool operator!=(const SelectionModel& sel) { return !(*this == sel); }
 
+  std::string ToString() const;
+
  private:
   friend class RenderText;
 
   // TODO(benrg): Generally the selection start should not be changed without
   // considering the effect on the caret affinity. This setter is exposed only
   // to RenderText to discourage misuse, and should probably be removed.
   void set_selection_start(size_t pos) { selection_.set_start(pos); }
 
   // Logical selection. The logical caret position is the end of the selection.
   ui::Range selection_;
@@ skipping 10 matching lines @@
   //          0                  |abcFED                     |abcFED
   //          1                  a|bcFED                     a|bcFED
   //          2                  ab|cFED                     ab|cFED
   //          3                  abc|FED                     abcFED|
   //          4                  abcFE|D                     abcFE|D
   //          5                  abcF|ED                     abcF|ED
   //          6                  abc|FED                     abcFED|
   LogicalCursorDirection caret_affinity_;
 };
 
-UI_EXPORT std::ostream& operator<<(std::ostream& out,
-                                   const SelectionModel& sel);
-
 }  // namespace gfx
 
 #endif  // UI_GFX_SELECTION_MODEL_H_