Disable flaky SettingsBasicPageBrowserTest.Load

This test is flaky. See the flakiness dashboard.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=network_service_browser_tests&tests=SettingsBasicPageBrowserTest.Load
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests&tests=SettingsBasicPageBrowserTest.Load

TBR=dpapad@chromium.org

Bug: 738146, 860069
Change-Id: I1d9b16d944a21c47e91d9aee76a6c95f3be701fe
Reviewed-on: https://chromium-review.googlesource.com/c/1307017Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603796}

chrome/test/data/webui/settings/basic_page_browsertest.js

@@ -22,7 +22,7 @@ SettingsBasicPageBrowserTest.prototype = {
 };
 
 // http://crbug/738146
-TEST_F('SettingsBasicPageBrowserTest', 'Load', function() {
+TEST_F('SettingsBasicPageBrowserTest', 'DISABLED_Load', function() {
   // Assign |self| to |this| instead of binding since 'this' in suite()
   // and test() will be a Mocha 'Suite' or 'Test' instance.
   const self = this;