Revert "Sheriff: Disable GestureNavigationScreenTest.FlowTest on MSAN"

This reverts commit e3564580.

Reason for revert: The issue that was causing crashes during the test seems to be resolved.

Original change's description:
> Sheriff: Disable GestureNavigationScreenTest.FlowTest on MSAN
> 
> Bug: 1109714
> Change-Id: If2ed226e624c78a97c8a7fe5434520464295eba9
> No-Try: True
> Tbr: achuith@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320129
> Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
> Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
> Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#791900}

TBR=achuith@chromium.org,adithyas@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1109714
Change-Id: I652c676041a8f25635dec7b9b7cf0995f6ffbd55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327318Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792999}

chrome/browser/chromeos/login/screens/gesture_navigation_screen_browsertest.cc

@@ -132,13 +132,7 @@ INSTANTIATE_TEST_SUITE_P(
                     TestMode::kClamshellWithForcedTabletFirstRun));
 
 // Ensure a working flow for the gesture navigation screen.
-// TODO(crbug.com/1109714): Test fails/crashes on MSAN.
-#if defined(MEMORY_SANITIZER)
-#define MAYBE_FlowTest DISABLED_FlowTest
-#else
-#define MAYBE_FlowTest FlowTest
-#endif
-IN_PROC_BROWSER_TEST_P(GestureNavigationScreenTest, MAYBE_FlowTest) {
+IN_PROC_BROWSER_TEST_P(GestureNavigationScreenTest, FlowTest) {
   ShowGestureNavigationScreen();
   OobeScreenWaiter(GestureNavigationScreenView::kScreenId).Wait();