Disable PDFExtensionHitTestTest.MouseLeave on CrOS MSan

...due to flakiness.

Bug: 892484
Change-Id: Ic947c7c7f9a7868249ec200e760ef3cdcf52ca1b
TBR: hnakashima@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1264381Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597060}

chrome/browser/pdf/pdf_extension_test.cc

@@ -1772,8 +1772,9 @@ IN_PROC_BROWSER_TEST_F(PDFExtensionTest, CtrlWheelInvokesCustomZoom) {
 
 #endif  // defined(OS_MACOSX)
 
-#if defined(OS_WIN) && defined(ADDRESS_SANITIZER)
-// https://crbug.com/856169
+#if (defined(OS_WIN) && defined(ADDRESS_SANITIZER)) || \
+    (defined(OS_CHROME) && defined(MEMORY_SANITIZER))
+// https://crbug.com/856169, https://crbug.com/892484
 #define MAYBE_MouseLeave DISABLED_MouseLeave
 #else
 #define MAYBE_MouseLeave MouseLeave