Fix clang build.

ui/gfx/render_text.h

 // Copyright (c) 2011 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_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 #pragma once
 
 #include <algorithm>
 #include <vector>
@@ skipping 150 matching lines @@
   bool insert_mode() const { return insert_mode_; }
   void toggle_insert_mode() { insert_mode_ = !insert_mode_; }
 
   bool focused() const { return focused_; }
   void set_focused(bool focused) { focused_ = focused; }
 
   const StyleRange& default_style() const { return default_style_; }
   void set_default_style(StyleRange style) { default_style_ = style; }
 
   const Rect& display_rect() const { return display_rect_; }
-  virtual void set_display_rect(const Rect& r) { display_rect_ = r; }
+  virtual void set_display_rect(const Rect& r);
 
   const Point& display_offset() const { return display_offset_; }
 
   // This cursor position corresponds to SelectionModel::selection_end. In
   // addition to representing the selection end, it's also where logical text
   // edits take place, and doesn't necessarily correspond to
   // SelectionModel::caret_pos.
   size_t GetCursorPosition() const;
   void SetCursorPosition(const size_t position);
 
@@ skipping 139 matching lines @@
   Rect display_rect_;
   // The offset for the text to be drawn, relative to the display area.
   Point display_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_