First fix to minimize copying of image data.

chrome/browser/dom_ui/dom_ui_thumbnail_source.cc

Index: chrome/browser/dom_ui/dom_ui_thumbnail_source.cc
diff --git a/chrome/browser/dom_ui/dom_ui_thumbnail_source.cc b/chrome/browser/dom_ui/dom_ui_thumbnail_source.cc
index acb82764d804f8c378660d61b8c7c1a52f14eaaa..c455b2671d5037a08159e652bffdeee6d0d3498d 100644
--- a/chrome/browser/dom_ui/dom_ui_thumbnail_source.cc
+++ b/chrome/browser/dom_ui/dom_ui_thumbnail_source.cc
@@ -64,9 +64,9 @@ void DOMUIThumbnailSource::DoDataRequest(const std::string& path,
   } else {
     // Don't have the thumbnail so return the default thumbnail.
     if (!default_thumbnail_.get()) {
-      default_thumbnail_ = new RefCountedBytes;
-      ResourceBundle::GetSharedInstance().LoadImageResourceBytes(
-          IDR_DEFAULT_THUMBNAIL, &default_thumbnail_->data);
+      default_thumbnail_ =
+          ResourceBundle::GetSharedInstance().LoadImageResourceBytes(
+              IDR_DEFAULT_THUMBNAIL);
     }
     SendResponse(request_id, default_thumbnail_);
   }
@@ -83,9 +83,9 @@ void DOMUIThumbnailSource::OnThumbnailDataAvailable(
     SendResponse(request_id, data);
   } else {
     if (!default_thumbnail_.get()) {
-      default_thumbnail_ = new RefCountedBytes;
-      ResourceBundle::GetSharedInstance().LoadImageResourceBytes(
-          IDR_DEFAULT_THUMBNAIL, &default_thumbnail_->data);
+      default_thumbnail_ =
+          ResourceBundle::GetSharedInstance().LoadImageResourceBytes(
+              IDR_DEFAULT_THUMBNAIL);
     }
 
     SendResponse(request_id, default_thumbnail_);