Change other usages of .size() to .empty() when applicable.

chrome/browser/ui/views/download_shelf_view.cc

 // 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.
 
 #include "chrome/browser/ui/views/download_shelf_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
@@ skipping 193 matching lines @@
 void DownloadShelfView::OpenedDownload(DownloadItemView* view) {
   if (CanAutoClose())
     mouse_watcher_.Start();
 }
 
 gfx::Size DownloadShelfView::GetPreferredSize() {
   gfx::Size prefsize(kRightPadding + kLeftPadding + kCloseAndLinkPadding, 0);
   AdjustSize(close_button_, &prefsize);
   AdjustSize(show_all_view_, &prefsize);
   // Add one download view to the preferred size.
-  if (download_views_.size() > 0) {
+  if (!download_views_.empty()) {
     AdjustSize(*download_views_.begin(), &prefsize);
     prefsize.Enlarge(kDownloadPadding, 0);
   }
   prefsize.Enlarge(0, kTopBottomPadding + kTopBottomPadding);
   if (shelf_animation_->is_animating()) {
     prefsize.set_height(static_cast<int>(
         static_cast<double>(prefsize.height()) *
                             shelf_animation_->GetCurrentValue()));
   }
   return prefsize;
@@ skipping 211 matching lines @@
     const DownloadItemView* download_item_view) {
   gfx::Rect bounds = download_item_view->bounds();
 
 #if defined(TOOLKIT_VIEWS)
   bounds.set_height(bounds.height() - 1);
   bounds.Offset(0, 3);
 #endif
 
   return bounds;
 }