Disable flaky OffscreenTabsApiTest.OffscreenTabMouseEvents for Win and Linux

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc

Index: chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc
diff --git a/chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc b/chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc
index ae61d164d5240b9b22611ac272d0fd2f7d942c5f..b99630a96e707227c33f4c04b21dfe949b31c039 100644
--- a/chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc
+++ b/chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc
@@ -22,7 +22,13 @@ IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, DISABLED_OffscreenTabBasics) {
 }
 
 
-IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabMouseEvents) {
+#if defined (OS_WIN) || defined (OS_LINUX)
+// http://crbug.com/142993 - this times out flakily on Win/Linux
+#define MAYBE_OffscreenTabMouseEvents DISABLED_OffscreenTabMouseEvents
+#else
+#define MAYBE_OffscreenTabMouseEvents OffscreenTabMouseEvents
+#endif
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, MAYBE_OffscreenTabMouseEvents) {
   ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
                                   "mouse_events.html")) << message_;
 }