Enable Error Console for ADT and <= Dev Channel

chrome/browser/extensions/error_console/error_console_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/error_console/error_console.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
@@ skipping 185 matching lines @@
     ACTION_NEW_TAB,
     // Do nothing (errors will be caused by a background script,
     // or by a manifest/loading warning).
     ACTION_NONE
   };
 
   virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
     ExtensionBrowserTest::SetUpInProcessBrowserTestFixture();
 
     // We need to enable the ErrorConsole FeatureSwitch in order to collect
-    // errors.
+    // errors. This should be enabled on any channel <= Dev, but let's make
+    // sure (in case a test is running on, e.g., a beta channel).
     FeatureSwitch::error_console()->SetOverrideValue(
         FeatureSwitch::OVERRIDE_ENABLED);
   }
 
   virtual void SetUpOnMainThread() OVERRIDE {
     ExtensionBrowserTest::SetUpOnMainThread();
 
     // Errors are only kept if we have Developer Mode enabled.
     profile()->GetPrefs()->SetBoolean(prefs::kExtensionsUIDeveloperMode, true);
 
@@ skipping 328 matching lines @@
   const Extension* extension = NULL;
   LoadExtensionAndCheckErrors(
       "bad_extension_page",
       kNoFlags,
       1,  // One error: the page will load JS which has a reference error.
       ACTION_NEW_TAB,
       &extension);
 }
 
 }  // namespace extensions