Disable flaky KillGuestCommunicatingWithWrongAppView on Linux.

chrome/browser/apps/guest_view/app_view_browsertest.cc

Index: chrome/browser/apps/guest_view/app_view_browsertest.cc
diff --git a/chrome/browser/apps/guest_view/app_view_browsertest.cc b/chrome/browser/apps/guest_view/app_view_browsertest.cc
index 865583ba47e2be24ee2fb1b2d2696b622d5e64ee..70c2c3dc130d83c4441400566ce764950014fac4 100644
--- a/chrome/browser/apps/guest_view/app_view_browsertest.cc
+++ b/chrome/browser/apps/guest_view/app_view_browsertest.cc
@@ -238,7 +238,15 @@ IN_PROC_BROWSER_TEST_P(AppViewTest, KillGuestWithInvalidInstanceID) {
   exit_observer.WaitUntilRenderProcessHostKilled();
 }
 
-IN_PROC_BROWSER_TEST_P(AppViewTest, KillGuestCommunicatingWithWrongAppView) {
+#if defined(OS_LINUX)
+#define MAYBE_KillGuestCommunicatingWithWrongAppView \
+    DISABLED_KillGuestCommunicatingWithWrongAppView
+#else
+#define MAYBE_KillGuestCommunicatingWithWrongAppView \
+    KillGuestCommunicatingWithWrongAppView
+#endif
+IN_PROC_BROWSER_TEST_P(AppViewTest,
+                       MAYBE_KillGuestCommunicatingWithWrongAppView) {
   const extensions::Extension* host_app =
       LoadAndLaunchPlatformApp("app_view/host_app", "AppViewTest.LAUNCHED");
   const extensions::Extension* guest_app =