app_list: Remove unnecessary using declaration from drop_shadow_label.cc.

ui/app_list/drop_shadow_label.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/drop_shadow_label.h"
 
-#include "base/utf_string_conversions.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/canvas.h"
-#include "ui/gfx/color_utils.h"
 #include "ui/gfx/insets.h"
-#include "ui/gfx/skbitmap_operations.h"
-
-using views::Label;
 
 namespace app_list {
 
 DropShadowLabel::DropShadowLabel() {
 }
 
 DropShadowLabel::~DropShadowLabel() {
 }
 
 void DropShadowLabel::SetTextShadows(int shadow_count,
@@ skipping 22 matching lines @@
   SkColor text_color = enabled() ? enabled_color() : disabled_color();
   canvas->DrawStringWithShadows(text,
                                 font(),
                                 text_color,
                                 text_bounds,
                                 flags,
                                 text_shadows_);
 
   if (HasFocus() || paint_as_focused()) {
     gfx::Rect focus_bounds = text_bounds;
-    focus_bounds.Inset(-Label::kFocusBorderPadding,
-                       -Label::kFocusBorderPadding);
+    focus_bounds.Inset(-views::Label::kFocusBorderPadding,
+                       -views::Label::kFocusBorderPadding);
     canvas->DrawFocusRect(focus_bounds);
   }
 }
 
 }  // namespace app_list