Disables on mac DownloadTest.DownloadTest_PercentComplete as its

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 2838 matching lines @@
   download_item->Cancel(true);
   EXPECT_TRUE(download_item->IsCancelled());
 }
 
 // The Mac downloaded files quarantine feature is implemented by the
 // Contents/Info.plist file in cocoa apps. browser_tests cannot test
 // quarantining files on Mac because it is not a cocoa app.
 // TODO(benjhayden) test the equivalents on other platforms.
 
 // Test downloading a huge file and that PercentComplete is monotonic.
-IN_PROC_BROWSER_TEST_F(DownloadTest, DownloadTest_PercentComplete) {
+
+// Disable on mac: http://crbug.com/238831
+#if defined(OS_MACOSX)
+#define MAYBE_DownloadTest_PercentComplete DISABLED_DownloadTest_PercentComplete
+#else
+#define MAYBE_DownloadTest_PercentComplete DownloadTest_PercentComplete
+#endif
+IN_PROC_BROWSER_TEST_F(DownloadTest, MAYBE_DownloadTest_PercentComplete) {
   // Write a huge file.
   base::FilePath file_path(DestinationFile(
       browser(), base::FilePath(FILE_PATH_LITERAL("DownloadTest_BigZip.zip"))));
   int flags = (base::PLATFORM_FILE_CREATE |
                base::PLATFORM_FILE_WRITE);
   bool created = false;
   base::PlatformFileError error = base::PLATFORM_FILE_ERROR_MAX;
   base::PlatformFile fd = base::CreatePlatformFile(
       file_path, flags, &created, &error);
   int64 size = 1 << 29;
@@ skipping 54 matching lines @@
   scoped_ptr<content::DownloadTestObserver> observer(
       DangerousDownloadWaiter(
           browser(), 1,
           content::DownloadTestObserver::ON_DANGEROUS_DOWNLOAD_DENY));
   ui_test_utils::NavigateToURL(browser(), url);
   observer->WaitForFinished();
   EXPECT_EQ(1u, observer->NumDownloadsSeenInState(DownloadItem::CANCELLED));
   EXPECT_EQ(1u, observer->NumDangerousDownloadsSeen());
   EXPECT_FALSE(browser()->window()->IsDownloadShelfVisible());
 }