Fix ifdefs around INSTANTIATE_TEST_CASE_P in tab_drag_controller_inte…

…ractive_uitest.cc

The tests were instantiated as
  #if ash && chromeos
  #elif ash
  #endif

Since we've droped USE_ASH form most configurations, this means tests
were no longer being instantiated anywhere except ChromeOS.

Review URL: https://codereview.chromium.org/1755513002

Cr-Commit-Position: refs/heads/master@{#378602}

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

@@ -2255,8 +2255,6 @@ IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTestTouch,
   ASSERT_TRUE(ReleaseInput2());
 }
 
-#if defined(OS_CHROMEOS)
-
 namespace {
 
 void DetachToDockedWindowNextStep(
@@ -2342,9 +2340,7 @@ IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
 
 #endif  // OS_CHROMEOS
 
-#endif
-
-#if defined(USE_ASH) && defined(OS_CHROMEOS)  // TODO(win_ash,linux_ash)
+#if defined(USE_ASH)
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserInSeparateDisplayTabDragControllerTest,
                         ::testing::Values("mouse", "touch"));
@@ -2357,7 +2353,7 @@ INSTANTIATE_TEST_CASE_P(TabDragging,
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTestTouch,
                         ::testing::Values("touch"));
-#elif defined(USE_ASH)
+#else
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTest,
                         ::testing::Values("mouse"));