Enable extensions error button test that was failing on stable.

chrome/browser/extensions/error_console/error_console.cc

Index: chrome/browser/extensions/error_console/error_console.cc
diff --git a/chrome/browser/extensions/error_console/error_console.cc b/chrome/browser/extensions/error_console/error_console.cc
index 393f76f8e460dd8aa2d40cf7ed40f13e082c4f06..323dd7a7825e67f42123908975a96f704549803a 100644
--- a/chrome/browser/extensions/error_console/error_console.cc
+++ b/chrome/browser/extensions/error_console/error_console.cc
@@ -169,9 +169,13 @@ void ErrorConsole::RemoveObserver(Observer* observer) {
 }
 
 bool ErrorConsole::IsEnabledForChromeExtensionsPage() const {
-  return profile_->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode) &&
-         (FeatureSwitch::error_console()->IsEnabled() ||
-          GetCurrentChannel() <= chrome::VersionInfo::CHANNEL_DEV);
+  if (!profile_->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode))
+    return false;  // Only enabled in developer mode.
+  if (GetCurrentChannel() > chrome::VersionInfo::CHANNEL_DEV &&
+      !FeatureSwitch::error_console()->IsEnabled())
+    return false;  // Restricted to dev channel or opt-in.
+
+  return true;
 }
 
 bool ErrorConsole::IsEnabledForAppsDeveloperTools() const {