Disabling flaky PointerLock_PointerLockLostWithFocus on Linux.

TBR=wjmaclean,rdevlin.cronin
BUG=678267

Review-Url: https://codereview.chromium.org/2616693002
Cr-Commit-Position: refs/heads/master@{#441467}

chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

@@ -1110,8 +1110,16 @@ IN_PROC_BROWSER_TEST_P(WebViewInteractiveTest, Navigation_BackForwardKeys) {
   ASSERT_TRUE(done_listener.WaitUntilSatisfied());
 }
 
+// Flaky on Linux: crbug.com/678267
+#if defined(OS_LINUX)
+#define MAYBE_PointerLock_PointerLockLostWithFocus \
+  DISABLED_PointerLock_PointerLockLostWithFocus
+#else
+#define MAYBE_PointerLock_PointerLockLostWithFocus \
+  PointerLock_PointerLockLostWithFocus
+#endif
 IN_PROC_BROWSER_TEST_P(WebViewPointerLockInteractiveTest,
-                       PointerLock_PointerLockLostWithFocus) {
+                       MAYBE_PointerLock_PointerLockLostWithFocus) {
   TestHelper("testPointerLockLostWithFocus",
              "web_view/pointerlock",
              NO_TEST_SERVER);