Coverity: Fixing pass by value bugs

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 108 matching lines @@
   bool cursor_visible() const { return cursor_visible_; }
   void set_cursor_visible(bool visible) { cursor_visible_ = visible; }
 
   bool insert_mode() const { return insert_mode_; }
   void ToggleInsertMode();
 
   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; }
+  void set_default_style(const StyleRange& style) { default_style_ = style; }
 
   const Rect& display_rect() const { return display_rect_; }
   void SetDisplayRect(const Rect& r);
 
   // 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(size_t position);
@@ skipping 220 matching lines @@
   // The cached bounds and offset are invalidated by changes to the cursor,
   // selection, font, and other operations that adjust the visible text bounds.
   bool cached_bounds_and_offset_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_