split view: Revise comment in unit test

Bug: 890029
Change-Id: I380cddc0165b24d18fc91a8aef48778b4c65ccbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097129Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749236}

ash/wm/overview/overview_session_unittest.cc

@@ -5957,7 +5957,7 @@ TEST_P(SplitViewOverviewSessionInClamshellTest, BasicFunctionalitiesTest) {
   EXPECT_FALSE(overview_controller()->InOverviewSession());
   EXPECT_FALSE(split_view_controller()->InSplitViewMode());
 
-  // 8. Test if splitview is active, open the app list will end overview if
+  // 8. Test if splitview is not active, open the app list will end overview if
   // overview is active.
   ToggleOverview();
   // Open app list.