Enable extensions error button test that was failing on stable.

chrome/browser/ui/webui/extensions/extension_settings_browsertest.js

Index: chrome/browser/ui/webui/extensions/extension_settings_browsertest.js
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_browsertest.js b/chrome/browser/ui/webui/extensions/extension_settings_browsertest.js
index b12d501df3090b5962fbc05b72ba3633b2053d9d..e835910a9bffe8f3b0724a683bbbac070e388123 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_browsertest.js
+++ b/chrome/browser/ui/webui/extensions/extension_settings_browsertest.js
@@ -271,22 +271,63 @@ TEST_F('BasicExtensionSettingsWebUITest', 'testNonEmptyExtensionList',
   this.nextStep();
 });
 
-function AsyncExtensionSettingsWebUITest() {}
+function DisableErrorButtonExtensionSettingsWebUITest() {}
 
-AsyncExtensionSettingsWebUITest.prototype = {
+DisableErrorButtonExtensionSettingsWebUITest.prototype = {
   __proto__: ExtensionSettingsWebUITest.prototype,
 
   /** @override */
   testGenPreamble: function() {
+    GEN('  DisableErrorConsole();');
+
     GEN('  InstallGoodExtension();');
     GEN('  InstallErrorsExtension();');
   },
 };
 
-// Still fails on CrWinClang tester. BUG=463245
-TEST_F('AsyncExtensionSettingsWebUITest',
-       'DISABLED_testErrorListButtonVisibility',
-    function() {
+TEST_F('DisableErrorButtonExtensionSettingsWebUITest',
+       'errorListButtonsHiddenIfNotDev', function() {
+  var testButtonVisibility = function() {
+    var extensionList = $('extension-list-wrapper');
+
+    // 2 extensions are loaded:
+    //   The 'good' extension will have 0 errors.
+    //   The 'bad' extension will have >3 manifest errors and <3 runtime errors.
+    // Both buttons should be hidden.
+
+    var visibleButtons = extensionList.querySelectorAll(
+        '.errors-link:not([hidden])');
+    expectEquals(0, visibleButtons.length);
+
+    var hiddenButtons = extensionList.querySelectorAll('.errors-link[hidden]');
+    expectEquals(2, hiddenButtons.length);
+
+    this.nextStep();
+  };
+
+  this.steps = [this.waitForPageLoad,
+                this.enableDeveloperMode,
+                testButtonVisibility,
+                testDone];
+  this.nextStep();
+});
+
+function EnableErrorButtonExtensionSettingsWebUITest() {}
+
+EnableErrorButtonExtensionSettingsWebUITest.prototype = {
+  __proto__: ExtensionSettingsWebUITest.prototype,
+
+  /** @override */
+  testGenPreamble: function() {
+    GEN('  EnableErrorConsole();');
+
+    GEN('  InstallGoodExtension();');
+    GEN('  InstallErrorsExtension();');
+  },
+};
+
+TEST_F('EnableErrorButtonExtensionSettingsWebUITest',
+       'testErrorListButtonVisibility', function() {
   var testButtonVisibility = function() {
     var extensionList = $('extension-list-wrapper');