ui/base/clipboard: Remove unused include.

Change-Id: Ie2125b4bc4cf46db8f0e0f73f80dd30224ae049a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254352Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782057}

ui/base/clipboard/test/clipboard_test_util.h

@@ -5,8 +5,6 @@
 #ifndef UI_BASE_CLIPBOARD_TEST_CLIPBOARD_TEST_UTIL_H_
 #define UI_BASE_CLIPBOARD_TEST_CLIPBOARD_TEST_UTIL_H_
 
-#include "base/macros.h"
-
 class SkBitmap;
 
 namespace ui {