Reland "Disable WelcomeScreenBrowserTest.WelcomeScreenNext."

This reverts commit 60f3e975.

Reason for revert:
WelcomeScreenBrowserTest.WelcomeScreenNext is still flaky on ChromeOS,
https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyTAsSBUZsYWtlIkFjaHJvbWl1bUBicm93c2VyX3Rlc3RzQFdlbGNvbWVTY3JlZW5Ccm93c2VyVGVzdC5XZWxjb21lU2NyZWVuTmV4dAw

Original change's description:
> Revert "Disable WelcomeScreenBrowserTest.WelcomeScreenNext."
> 
> This reverts commit 2aa5da39.
> 
> Reason for revert: reenabling given crrev.com/1864618
> 
> Original change's description:
> > Disable WelcomeScreenBrowserTest.WelcomeScreenNext.
> > 
> > Bug: 1014952
> > Change-Id: I1df1941c2a0a92d243cb4e4624ae920b150c7694
> > Tbr: achuith@chromium.org
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865351
> > Reviewed-by: John Budorick <jbudorick@chromium.org>
> > Commit-Queue: John Budorick <jbudorick@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#706500}
> 
> TBR=achuith@chromium.org,jbudorick@chromium.org
> 
> Change-Id: I86cba6fe329f52b5bdcd7b07d04d1dfb40fa65cf
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 1014952
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866407
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#706891}

TBR=achuith@chromium.org,jbudorick@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1014952
Change-Id: I57bebd90ee517d2c2d729fc91dcef9667ea3ebe0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869073Reviewed-by: Lan Wei <lanwei@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707486}

chrome/browser/chromeos/login/screens/welcome_screen_browsertest.cc

@@ -196,7 +196,8 @@ IN_PROC_BROWSER_TEST_F(WelcomeScreenBrowserTest, WelcomeScreenElements) {
       {"connect", "welcomeScreen", "enableDebuggingLink"});
 }
 
-IN_PROC_BROWSER_TEST_F(WelcomeScreenBrowserTest, WelcomeScreenNext) {
+// Flaky: crbug.com/1014952
+IN_PROC_BROWSER_TEST_F(WelcomeScreenBrowserTest, DISABLED_WelcomeScreenNext) {
   welcome_screen_->Show();
   OobeScreenWaiter(WelcomeView::kScreenId).Wait();
   test::OobeJS().TapOnPath({"connect", "welcomeScreen", "welcomeNextButton"});