Disable ExtensionApiTestWithManagementPolicy.UrlProtectedByPolicy.

The test is flaky.

BUG=835155
NOTRY=true

Change-Id: I3f8f98e34aedefd198ba3c1594d35d85c262e7ce
Reviewed-on: https://chromium-review.googlesource.com/1024195Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552724}

chrome/browser/extensions/api/web_request/web_request_apitest.cc

@@ -1419,8 +1419,9 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTestWithManagementPolicy,
 
 // Tests that the webRequest events aren't dispatched when the URL of the
 // request is protected by policy.
+// Disabled because it is flaky. See https://crbug.com/835155
 IN_PROC_BROWSER_TEST_F(ExtensionApiTestWithManagementPolicy,
-                       UrlProtectedByPolicy) {
+                       DISABLED_UrlProtectedByPolicy) {
   // Host protected by policy.
   const std::string protected_domain = "example.com";