Make sure sideload wipeout doesn't interfere with the tests.

chrome/browser/extensions/extension_service.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/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 2173 matching lines @@
 
 void ExtensionService::MaybeWipeout(
     const extensions::Extension* extension) {
   if (!FeatureSwitch::sideload_wipeout()->IsEnabled())
     return;
 
   bool done = extension_prefs_->GetSideloadWipeoutDone();
   if (done)
     return;
 
+  Extension::Type type = extension->GetType();
   int disable_reasons = extension_prefs_->GetDisableReasons(extension->id());
-  if (disable_reasons == Extension::DISABLE_NONE) {
+  if (disable_reasons == Extension::DISABLE_NONE &&
+      type == Extension::TYPE_EXTENSION) {
     Extension::Location location = extension->location();
     if (location == Extension::EXTERNAL_REGISTRY ||
         (location == Extension::INTERNAL && !extension->from_webstore())) {
       extension_prefs_->SetExtensionState(extension->id(), Extension::DISABLED);
       extension_prefs_->AddDisableReason(
           extension->id(),
           static_cast<Extension::DisableReason>(
           Extension::DISABLE_SIDELOAD_WIPEOUT));
     }
   }
@@ skipping 579 matching lines @@
     // enabling them.
     if (Extension::IsExternalLocation(extension->location()) &&
         !extension_prefs_->IsExternalExtensionAcknowledged(extension->id())) {
       return false;
     }
   }
 #endif
 
   return true;
 }