[Sheriff] Disable failing test TaskManagerNewPrintPreview.

This test started failing constantly in 
http://build.chromium.org/p/chromium.mac/builders/Mac%2010.7%20Tests%20%28dbg%29%281%29/builds/23020

But there is no obvious CL that caused the problem. The root cause seems to be related to 367665, so this test is now disabled on Mac until the root cause is found.

BUG=367665
TBR=nick@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/252893007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266758 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -87,7 +87,13 @@ IN_PROC_BROWSER_TEST_F(PrintPreviewTest, PrintCommands) {
   ASSERT_TRUE(chrome::IsCommandEnabled(browser(), IDC_ADVANCED_PRINT));
 }
 
-IN_PROC_BROWSER_TEST_F(PrintPreviewTest, TaskManagerNewPrintPreview) {
+// Disable the test for mac, see http://crbug/367665.
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#define MAYBE_TaskManagerNewPrintPreview DISABLED_TaskManagerNewPrintPreview
+#else
+#define MAYBE_TaskManagerNewPrintPreview TaskManagerNewPrintPreview
+#endif
+IN_PROC_BROWSER_TEST_F(PrintPreviewTest, MAYBE_TaskManagerNewPrintPreview) {
   chrome::ShowTaskManager(browser());  // Show task manager BEFORE print dialog.
 
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, MatchAboutBlankTab()));