Fix double ripple on activated flood fill ripple

ui/views/animation/ink_drop_highlight_unittest.cc

Index: ui/views/animation/ink_drop_highlight_unittest.cc
diff --git a/ui/views/animation/ink_drop_highlight_unittest.cc b/ui/views/animation/ink_drop_highlight_unittest.cc
index fa5cc88058660d7bbdd3d0568ac5ccb41001bb4c..fa983daff613131055165ce98e2a953bcee30e7a 100644
--- a/ui/views/animation/ink_drop_highlight_unittest.cc
+++ b/ui/views/animation/ink_drop_highlight_unittest.cc
@@ -56,7 +56,10 @@ InkDropHighlightTest::InkDropHighlightTest() {
       gfx::Size(10, 10), 3, gfx::PointF(), SK_ColorBLACK));
 }
 
-InkDropHighlightTest::~InkDropHighlightTest() {}
+InkDropHighlightTest::~InkDropHighlightTest() {
+  // Destory highlight to make sure it is destroyed before the observer.
+  DestroyHighlight();
+}
 
 void InkDropHighlightTest::InitHighlight(
     std::unique_ptr<InkDropHighlight> new_highlight) {