Reintroduce --prompt-for-external-extensions flag on Chromium builds.

extensions/common/feature_switch.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 "extensions/common/feature_switch.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
 #include "extensions/common/switches.h"
 
 namespace extensions {
 
 namespace {
 
 class CommonSwitches {
  public:
   CommonSwitches()
       : easy_off_store_install(NULL, FeatureSwitch::DEFAULT_DISABLED),
         force_dev_mode_highlighting(switches::kForceDevModeHighlighting,
                                     FeatureSwitch::DEFAULT_DISABLED),
-        prompt_for_external_extensions(NULL,
+        prompt_for_external_extensions(
+#if defined(CHROMIUM_BUILD)
+            switches::kPromptForExternalExtensions,
+#else
+            NULL,
+#endif
 #if defined(OS_WIN)
-                                       FeatureSwitch::DEFAULT_ENABLED),
+            FeatureSwitch::DEFAULT_ENABLED),
 #else
-                                       FeatureSwitch::DEFAULT_DISABLED),
+            FeatureSwitch::DEFAULT_DISABLED),
 #endif
         error_console(switches::kErrorConsole, FeatureSwitch::DEFAULT_DISABLED),
         enable_override_bookmarks_ui(switches::kEnableOverrideBookmarksUI,
                                      FeatureSwitch::DEFAULT_DISABLED),
         extension_action_redesign(switches::kExtensionActionRedesign,
                                   FeatureSwitch::DEFAULT_DISABLED),
         scripts_require_action(switches::kScriptsRequireAction,
                                FeatureSwitch::DEFAULT_DISABLED),
         embedded_extension_options(switches::kEmbeddedExtensionOptions,
                                    FeatureSwitch::DEFAULT_DISABLED),
@@ skipping 128 matching lines @@
 
 void FeatureSwitch::SetOverrideValue(OverrideValue override_value) {
   override_value_ = override_value;
 }
 
 FeatureSwitch::OverrideValue FeatureSwitch::GetOverrideValue() const {
   return override_value_;
 }
 
 }  // namespace extensions