MD Extensions: Enable Error Console by default.

Bug: 812491
Change-Id: I54005b49e976eeffd98a1a3f5b258fc4f9efe8ce
Reviewed-on: https://chromium-review.googlesource.com/1008623
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551106}

extensions/common/feature_switch.cc

@@ -35,7 +35,7 @@ class CommonSwitches {
 #else
             FeatureSwitch::DEFAULT_DISABLED),
 #endif
-        error_console(switches::kErrorConsole, FeatureSwitch::DEFAULT_DISABLED),
+        error_console(switches::kErrorConsole, FeatureSwitch::DEFAULT_ENABLED),
         enable_override_bookmarks_ui(switches::kEnableOverrideBookmarksUI,
                                      FeatureSwitch::DEFAULT_DISABLED),
         scripts_require_action(switches::kScriptsRequireAction,