Remove some dead code in ThumbnailGenerator.

chrome/browser/tab_contents/thumbnail_generator.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 CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #define CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #pragma once
 
 #include <map>
 #include <utility>
@@ skipping 61 matching lines @@
 
   // Starts taking thumbnails of the given tab contents.
   void StartThumbnailing(content::WebContents* web_contents);
 
   // Enables or disables the function of taking thumbnails.
   // A disabled ThumbnailGenerator generates no thumbnails although it still
   // continues to receive the notifications from the web contents.
   void set_enabled(bool enabled) { enabled_ = enabled; }
 
   // This registers a callback that can receive the resulting SkBitmap
-  // from the renderer when it is done rendering it.  This differs
-  // from GetThumbnailForRenderer in that it may be asynchronous, and
-  // because it will also fetch the bitmap even if the tab is hidden.
+  // from the renderer when it is done rendering it.  This is asynchronous,
+  // and it will also fetch the bitmap even if the tab is hidden.
   // In addition, if the renderer has to be invoked, the scaling of
   // the thumbnail happens on the rendering thread.
   //
   // Takes ownership of the callback object.
   //
-  // If |prefer_backing_store| is set, then the function will try and
-  // use the backing store for the page if it exists.  |page_size| is
-  // the size to render the page, and |desired_size| is the size to
-  // scale the resulting rendered page to (which is done efficiently
-  // if done in the rendering thread).  If |prefer_backing_store| is
-  // set, and the backing store is used, then the resulting image will
-  // be less then twice the size of the |desired_size| in both
+  // |page_size| is the size to render the page, and |desired_size| is
+  // the size to scale the resulting rendered page to (which is done
+  // efficiently if done in the rendering thread). The resulting image
+  // will be less then twice the size of the |desired_size| in both
   // dimensions, but might not be the exact size requested.
   void AskForSnapshot(content::RenderWidgetHost* renderer,
-                      bool prefer_backing_store,
                       const ThumbnailReadyCallback& callback,
                       gfx::Size page_size,
                       gfx::Size desired_size);
 
-  // This returns a thumbnail of a fixed, small size for the given
-  // renderer.
-  SkBitmap GetThumbnailForRenderer(content::RenderWidgetHost* renderer) const;
-
-  // This returns a thumbnail of a fixed, small size for the given
-  // renderer. |options| is a bitmask of ThumbnailOptions. If
-  // |clip_result| is non-NULL, the result of clipping will be written.
-  SkBitmap GetThumbnailForRendererWithOptions(
-      content::RenderWidgetHost* renderer,
-      int options,
-      ClipResult* clip_result) const;
-
   // Start or stop monitoring notifications for |renderer| based on the value
   // of |monitor|.
   void MonitorRenderer(content::RenderWidgetHost* renderer, bool monitor);
 
   // Calculates how "boring" a thumbnail is. The boring score is the
   // 0,1 ranged percentage of pixels that are the most common
   // luma. Higher boring scores indicate that a higher percentage of a
   // bitmap are all the same brightness.
   static double CalculateBoringScore(const SkBitmap& bitmap);
 
@@ skipping 65 matching lines @@
   bool load_interrupted_;
 
   base::WeakPtrFactory<ThumbnailGenerator> weak_factory_;
   scoped_ptr<base::WeakPtrFactory<content::WebContents> >
       web_contents_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailGenerator);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_