Disable a pair of NetworkContextConfigurationBrowserTests.

They are flaky on "non_single_process_mash_browser_tests", likely due
to https://chromium-review.googlesource.com/c/chromium/src/+/1443733.

These look like races with network configuration changes, so are not
real bugs.

NOTRY=true
TBR=asanka@chromium.org

Bug: 928685
Change-Id: I0a6ff4df635b26af56e1c8fd60ad2bc4c1525372
Reviewed-on: https://chromium-review.googlesource.com/c/1454124Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629137}

chrome/browser/net/network_context_configuration_browsertest.cc

@@ -1117,7 +1117,8 @@ IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, Hsts) {
 // Check that the SSLConfig is hooked up. PRE_SSLConfig checks that changing
 // local_state() after start modifies the SSLConfig, SSLConfig makes sure the
 // (now modified) initial value of local_state() is respected.
-IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, PRE_SSLConfig) {
+IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest,
+                       DISABLED_PRE_SSLConfig) {
   if (IsRestartStateWithInProcessNetworkService())
     return;
   // Start a TLS 1.0 server.
@@ -1164,7 +1165,8 @@ IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, PRE_SSLConfig) {
   EXPECT_EQ(net::ERR_SSL_VERSION_OR_CIPHER_MISMATCH, simple_loader->NetError());
 }
 
-IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, SSLConfig) {
+IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest,
+                       DISABLED_SSLConfig) {
   if (IsRestartStateWithInProcessNetworkService())
     return;
   // Start a TLS 1.0 server.
@@ -1191,7 +1193,8 @@ IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, SSLConfig) {
   EXPECT_EQ(net::ERR_SSL_VERSION_OR_CIPHER_MISMATCH, simple_loader->NetError());
 }
 
-IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest, ProxyConfig) {
+IN_PROC_BROWSER_TEST_P(NetworkContextConfigurationBrowserTest,
+                       DISABLED_ProxyConfig) {
   if (IsRestartStateWithInProcessNetworkService())
     return;
   SetProxyPref(embedded_test_server()->host_port_pair());