Re-enable EulaTest.LoadOffline

Bug: 817995
Change-Id: I305739b830ad9c628f6adc88ca930adccc4bfeea
Reviewed-on: https://chromium-review.googlesource.com/1054219Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557979}

chrome/browser/chromeos/login/eula_browsertest.cc

@@ -192,16 +192,18 @@ IN_PROC_BROWSER_TEST_F(EulaTest, LoadOnline) {
 
 // Tests that offline version is shown when the online version is not
 // accessible.
-// Disabled due to flaky timeouts; https://crbug.com/817995.
-IN_PROC_BROWSER_TEST_F(EulaTest, DISABLED_LoadOffline) {
+IN_PROC_BROWSER_TEST_F(EulaTest, LoadOffline) {
   set_allow_online_eula(false);
   ShowEulaScreen();
 
   content::WebContents* eula_contents = FindEulaContents();
   ASSERT_TRUE(eula_contents);
   // Wait for the fallback offline page (loaded as data url) to be loaded.
-  while (!eula_contents->GetLastCommittedURL().SchemeIs("data"))
+  while (!eula_contents->GetLastCommittedURL().SchemeIs("data")) {
+    // Pump messages to avoid busy loop so that renderer could do some work.
+    base::RunLoop().RunUntilIdle();
     WebContentsLoadFinishedWaiter(eula_contents).Wait();
+  }
 
   EXPECT_TRUE(GetLoadedEulaAsText().find(kOfflineEULAWarning) !=
               std::string::npos);