Disable PrinterProviderApiTest.PrintJobSuccess on Linux and CrOS

extensions/browser/api/printer_provider/printer_provider_apitest.cc

Index: extensions/browser/api/printer_provider/printer_provider_apitest.cc
diff --git a/extensions/browser/api/printer_provider/printer_provider_apitest.cc b/extensions/browser/api/printer_provider/printer_provider_apitest.cc
index f2e5b1a214f4ade71faac2792ae31b326c62625b..38e65126634d2fe12ed602e71e2c3fd47c8ad85a 100644
--- a/extensions/browser/api/printer_provider/printer_provider_apitest.cc
+++ b/extensions/browser/api/printer_provider/printer_provider_apitest.cc
@@ -366,7 +366,13 @@ class PrinterProviderApiTest : public ShellApiTest {
   DISALLOW_COPY_AND_ASSIGN(PrinterProviderApiTest);
 };
 
-IN_PROC_BROWSER_TEST_F(PrinterProviderApiTest, PrintJobSuccess) {
+// TODO(crbug.com/631983): Flaky on Linux and CrOS trybots.
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
+#define MAYBE_PrintJobSuccess DISABLED_PrintJobSuccess
+#else
+#define MAYBE_PrintJobSuccess PrintJobSuccess
+#endif  // defined(OS_CHROMEOS) || defined(OS_LINUX)
+IN_PROC_BROWSER_TEST_F(PrinterProviderApiTest, MAYBE_PrintJobSuccess) {
   RunPrintRequestTestApp("OK", PRINT_REQUEST_DATA_TYPE_BYTES, "OK");
 }