Remove some dead code in ThumbnailGenerator.

chrome/browser/tab_contents/thumbnail_generator.h

Index: chrome/browser/tab_contents/thumbnail_generator.h
diff --git a/chrome/browser/tab_contents/thumbnail_generator.h b/chrome/browser/tab_contents/thumbnail_generator.h
index 70d9e2f30d00712524c896de12661967f71e6757..cceb4837be9577222e39d5181676578bff5791fa 100644
--- a/chrome/browser/tab_contents/thumbnail_generator.h
+++ b/chrome/browser/tab_contents/thumbnail_generator.h
@@ -79,40 +79,23 @@ class ThumbnailGenerator : public content::NotificationObserver,
   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);