Disable PrintPreviewTest.TaskManagerNewPrintPreview.

It's constantly failing in linux/swarming in Debug.

TBR=vitalybuka@chromium.org
BUG=367665

Review URL: https://codereview.chromium.org/619763002

Cr-Commit-Position: refs/heads/master@{#297535}

chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc

@@ -85,7 +85,7 @@ IN_PROC_BROWSER_TEST_F(PrintPreviewTest, PrintCommands) {
 }
 
 // Disable the test for mac, see http://crbug/367665.
-#if defined(OS_MACOSX) && !defined(OS_IOS)
+#if (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_LINUX)
 #define MAYBE_TaskManagerNewPrintPreview DISABLED_TaskManagerNewPrintPreview
 #else
 #define MAYBE_TaskManagerNewPrintPreview TaskManagerNewPrintPreview