Disable ConditionalCacheDeletionHelperBrowserTest.TimeAndURL on linux

chrome/browser/browsing_data/conditional_cache_deletion_helper_browsertest.cc

 // Copyright (c) 2015 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 <algorithm>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 228 matching lines @@
   CompareRemainingKeys(keys);
 }
 
 // Tests that ConditionalCacheDeletionHelper correctly constructs a condition
 // for time and URL.
 //
 // Note: This test depends on the timing in cache backends and can be flaky
 // if those backends are slow. If this turns out to be a problem, consider
 // increasing the |timeout_ms| constant.
 //
-// Flakily timing out on Mac 10.11: https://crbug.com/646119
-#if defined(OS_MACOSX)
+// Flakily timing out on Mac 10.11 (crbug.com/646119) and flakily
+// failing on Linux/ChromeOS (crbug.com/624836).
+#if defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_CHROMEOS)
 #define MAYBE_TimeAndURL DISABLED_TimeAndURL
 #else
 #define MAYBE_TimeAndURL TimeAndURL
 #endif
 IN_PROC_BROWSER_TEST_F(ConditionalCacheDeletionHelperBrowserTest,
                        MAYBE_TimeAndURL) {
   const int64_t timeout_ms = 1;
 
   // Create some entries.
   std::set<std::string> keys;
@@ skipping 47 matching lines @@
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ConditionalCacheDeletionHelperBrowserTest::GetRemainingKeys,
                  base::Unretained(this)));
   WaitForTasksOnIOThread();
 
   keys.insert(newer_keys.begin(), newer_keys.end());
   keys.erase("https://example.com/foo/bar/icon2.png");
   keys.erase("https://example.com/foo/bar/icon3.png");
   CompareRemainingKeys(keys);
 }