Reenable NetworkContextConfigurationBrowserTests on ChromeOS.

crrev.com/c/1460185 and crrev.com/c/1457478 should have fixed these
tests on ChromeOS.

Bug: 927293
Change-Id: I506f4f5023e431df942797c6820feb7997e514cf
Reviewed-on: https://chromium-review.googlesource.com/c/1460125Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630415}

chrome/browser/net/network_context_configuration_browsertest.cc

@@ -1576,14 +1576,8 @@ class NetworkContextConfigurationProxyOnStartBrowserTest
 
 // Test that when there's a proxy configuration at startup, the initial requests
 // use that configuration.
-// Flaky on CrOS only. http://crbug.com/922876
-#if defined(OS_CHROMEOS)
-#define MAYBE_TestInitialProxyConfig DISABLED_TestInitialProxyConfig
-#else
-#define MAYBE_TestInitialProxyConfig TestInitialProxyConfig
-#endif
 IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationProxyOnStartBrowserTest,
-                       MAYBE_TestInitialProxyConfig) {
+                       TestInitialProxyConfig) {
   if (IsRestartStateWithInProcessNetworkService())
     return;
   TestProxyConfigured(/*expect_success=*/true);
@@ -1888,20 +1882,10 @@ IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationHttpsStrippingPacBrowserTest,
 // tested, and a suffix of "/0" if the network service is disabled, "/1" if it's
 // enabled, and "/2" if it's enabled and restarted.
 
-#if defined(OS_CHROMEOS)
-// There's an extra network change event on ChromeOS, likely from
-// NetworkChangeNotifierChromeos that makes these tests flaky on ChromeOS when
-// there's an out of process network stack.
-//
-// TODO(https://crbug.com/927293): Fix that, and enable these tests on ChromeOS.
-#define TEST_CASES(network_context_type) \
-  TestCase({NetworkServiceState::kDisabled, network_context_type})
-#else  // !defined(OS_CHROMEOS)
 #define TEST_CASES(network_context_type)                               \
   TestCase({NetworkServiceState::kDisabled, network_context_type}),    \
       TestCase({NetworkServiceState::kEnabled, network_context_type}), \
       TestCase({NetworkServiceState::kRestarted, network_context_type})
-#endif  // !defined(OS_CHROMEOS)
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #define INSTANTIATE_EXTENSION_TESTS(TestFixture)                        \