Disable DevicePolicyCloudExternalDataManagerTest.CleanUpResourceCache due to

persistent failures.

Bug: 1008275
TBR: nikitapodguzov
Change-Id: Ie35e6388214e84095432fa5cadebcc69e53286c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827291Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700286}

chrome/browser/chromeos/policy/device_policy_cloud_external_data_manager_browsertest.cc

@@ -186,8 +186,9 @@ IN_PROC_BROWSER_TEST_F(DevicePolicyCloudExternalDataManagerTest,
   EXPECT_EQ(0, ComputeExternalDataCacheDirectorySize());
 }
 
+// Disabled. See https://crbug.com/1008275.
 IN_PROC_BROWSER_TEST_F(DevicePolicyCloudExternalDataManagerTest,
-                       CleanUpResourceCache) {
+                       DISABLED_CleanUpResourceCache) {
   EXPECT_EQ(0, ComputeExternalDataCacheDirectorySize());
 
   std::string external_data = ReadExternalDataFile(kExternalDataPath);