Disable PointerLockBrowserTest.PointerLockWheelEventRouting on Linux

Due to flakiness.

Bug: 1205889
Change-Id: I946325c86c32bd1e40dbd7717e9b856299cc3adb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2876886
Auto-Submit: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#880326}

content/browser/pointer_lock_browsertest.cc

@@ -530,7 +530,13 @@ IN_PROC_BROWSER_TEST_F(PointerLockBrowserTest, PointerLockOopifCrashes) {
   }
 }
 
-IN_PROC_BROWSER_TEST_F(PointerLockBrowserTest, PointerLockWheelEventRouting) {
+#if defined(OS_LINUX)
+#define MAYBE_PointerLockWheelEventRouting DISABLED_PointerLockWheelEventRouting
+#else
+#define MAYBE_PointerLockWheelEventRouting PointerLockWheelEventRouting
+#endif
+IN_PROC_BROWSER_TEST_F(PointerLockBrowserTest,
+                       MAYBE_PointerLockWheelEventRouting) {
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b)"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));