Enable Extension script bubble.

chrome/common/extensions/feature_switch.cc

 // Copyright (c) 2012 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/common/extensions/feature_switch.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/field_trial.h"
 #include "base/string_util.h"
@@ skipping 13 matching lines @@
             switches::kEasyOffStoreExtensionInstall,
             FeatureSwitch::DEFAULT_DISABLED),
         extensions_in_action_box(
             switches::kExtensionsInActionBox,
             FeatureSwitch::DEFAULT_DISABLED),
         script_badges(
             switches::kScriptBadges,
             FeatureSwitch::DEFAULT_DISABLED),
         script_bubble(
             switches::kScriptBubble,
+#if !defined(OS_MACOSX)
+            FeatureSwitch::DEFAULT_ENABLED),
+#else
             FeatureSwitch::DEFAULT_DISABLED),
+#endif
         sideload_wipeout(
             switches::kSideloadWipeout,
 #if defined(OS_WIN)
             FeatureSwitch::DEFAULT_ENABLED),
 #else
             FeatureSwitch::DEFAULT_DISABLED),
 #endif
         prompt_for_external_extensions(
             switches::kPromptForExternalExtensions,
 #if defined(OS_WIN)
@@ skipping 118 matching lines @@
 
 void FeatureSwitch::SetOverrideValue(OverrideValue override_value) {
   override_value_ = override_value;
 }
 
 FeatureSwitch::OverrideValue FeatureSwitch::GetOverrideValue() const {
   return override_value_;
 }
 
 }  // namespace extensions