Add DCHECKs to StatefulExternalExtensionProvider

chrome/browser/extensions/stateful_external_extension_provider.cc

 // Copyright (c) 2010 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/stateful_external_extension_provider.h"
 
 #include "app/app_paths.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
@@ skipping 16 matching lines @@
     Extension::Location download_location)
   : crx_location_(crx_location),
     download_location_(download_location) {
 }
 
 StatefulExternalExtensionProvider::~StatefulExternalExtensionProvider() {
 }
 
 void StatefulExternalExtensionProvider::VisitRegisteredExtension(
     Visitor* visitor) const {
+  DCHECK(prefs_.get());
   for (DictionaryValue::key_iterator i = prefs_->begin_keys();
        i != prefs_->end_keys(); ++i) {
     const std::string& extension_id = *i;
     DictionaryValue* extension;
     if (!prefs_->GetDictionaryWithoutPathExpansion(extension_id, &extension))
       continue;
 
     FilePath::StringType external_crx;
     std::string external_version;
     std::string external_update_url;
@@ skipping 66 matching lines @@
         continue;
       }
       visitor->OnExternalExtensionUpdateUrlFound(
           extension_id, update_url, download_location_);
     }
   }
 }
 
 bool StatefulExternalExtensionProvider::HasExtension(
     const std::string& id) const {
+  DCHECK(prefs_.get());
   return prefs_->HasKey(id);
 }
 
 bool StatefulExternalExtensionProvider::GetExtensionDetails(
     const std::string& id, Extension::Location* location,
     scoped_ptr<Version>* version) const {
+  DCHECK(prefs_.get());
   DictionaryValue* extension = NULL;
   if (!prefs_->GetDictionary(id, &extension))
     return false;
 
   Extension::Location loc = Extension::INVALID;
   if (extension->HasKey(kExternalUpdateUrl)) {
     loc = download_location_;
 
   } else if (extension->HasKey(kExternalCrx)) {
     loc = crx_location_;
 
     std::string external_version;
     if (!extension->GetString(kExternalVersion, &external_version))
       return false;
 
     if (version)
       version->reset(Version::GetVersionFromString(external_version));
 
   } else {
     NOTREACHED();  // Chrome should not allow prefs to get into this state.
     return false;
   }
 
   if (location)
     *location = loc;
 
   return true;
 }
+
+void StatefulExternalExtensionProvider::set_prefs(DictionaryValue* prefs) {
+  prefs_.reset(prefs);
+}