Revert "Mark ScrollViewTest.ClipHeightToShortContentHeight flaky on Mac"

This reverts commit 5f5ef388.

Reason for revert: he test flakiness is caused by bot flakiness.

Original change's description:
> Mark ScrollViewTest.ClipHeightToShortContentHeight flaky on Mac
> 
> This patch marks ScrollViewTest.ClipHeightToShortContentHeight flaky on Mac.
> 
> TBR=kylixrd@chromium.org
> 
> Bug: 903001
> Change-Id: Iccc1792d207b44fe05d8abb3f1d86687a8567eec
> Reviewed-on: https://chromium-review.googlesource.com/c/1325275
> Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
> Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#606337}

TBR=yosin@chromium.org

Change-Id: I06d5f420c5fcf8570812aa8b055e259a0861bbe1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 903001
Reviewed-on: https://chromium-review.googlesource.com/c/1325278Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606344}

ui/views/controls/scroll_view_unittest.cc

@@ -763,14 +763,7 @@ TEST_F(ScrollViewTest, ClipHeightToNormalContentHeight) {
 
 // Verifies ClipHeightTo() uses the minimum height when the content is shorter
 // than the minimum height value.
-// TODO(crbug.com/903001): We should not mark GetIndexOf flaky.
-#if defined(OS_MACOSX)
-#define MAYBE_ClipHeightToShortContentHeight \
-  DISABLED_ClipHeightToShortContentHeight
-#else
-#define MAYBE_ClipHeightToShortContentHeight ClipHeightToShortContentHeight
-#endif
-TEST_F(ScrollViewTest, MAYBE_ClipHeightToShortContentHeight) {
+TEST_F(ScrollViewTest, ClipHeightToShortContentHeight) {
   scroll_view_->ClipHeightTo(kMinHeight, kMaxHeight);
 
   const int kShortContentHeight = 10;