Fixed all unused-variable Clang warnings on Windows.

ui/app_list/views/app_list_item_view.cc

 // 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.
 
 #include "ui/app_list/views/app_list_item_view.h"
 
 #include <algorithm>
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 31 matching lines @@
 
 const int kTopPadding = 18;
 const int kIconTitleSpacing = 6;
 const int kProgressBarHorizontalPadding = 12;
 
 // Radius of the folder dropping preview circle.
 const int kFolderPreviewRadius = 40;
 
 const int kLeftRightPaddingChars = 1;
 
+#if !defined(OS_WIN)
 // Scale to transform the icon when a drag starts.
 const float kDraggingIconScale = 1.5f;
+#endif
 
 // Delay in milliseconds of when the dragging UI should be shown for mouse drag.
 const int kMouseDragUIDelayInMs = 200;
 
 gfx::FontList GetFontList() {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   const gfx::FontList& font_list = rb.GetFontList(kItemTextFontStyle);
 // The font is different on each platform. The font size is adjusted on some
 // platforms to keep a consistent look.
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
@@ skipping 507 matching lines @@
   SetItemPercentDownloaded(item_weak_->percent_downloaded());
 }
 
 void AppListItemView::ItemBeingDestroyed() {
   DCHECK(item_weak_);
   item_weak_->RemoveObserver(this);
   item_weak_ = NULL;
 }
 
 }  // namespace app_list