Adding the --load-component-extension flag.

chrome/browser/extensions/extension_prefs.cc

 // Copyright (c) 2011 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_prefs.h"
 
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_pref_store.h"
@@ skipping 331 matching lines @@
     if (extension_dict->GetInteger(kPrefLocation, &location_value) &&
         location_value == Extension::LOAD) {
       // Unpacked extensions will already have absolute paths.
       continue;
     }
 
     FilePath::StringType path_string;
     if (!extension_dict->GetString(kPrefPath, &path_string))
       continue;
 
-    DCHECK(!FilePath(path_string).IsAbsolute());
+    DCHECK(location_value == Extension::COMPONENT ||
+           !FilePath(path_string).IsAbsolute());
     extension_dict->SetString(
         kPrefPath, install_directory_.Append(path_string).value());
   }
 }
 
 DictionaryValue* ExtensionPrefs::CopyCurrentExtensions() {
   const DictionaryValue* extensions = prefs_->GetDictionary(kExtensionsPref);
   if (extensions) {
     DictionaryValue* copy = extensions->DeepCopy();
     MakePathsAbsolute(copy);
@@ skipping 1466 matching lines @@
   prefs->RegisterListPref(prefs::kExtensionInstallAllowList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kExtensionInstallDenyList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kExtensionInstallForceList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterStringPref(kWebStoreLogin,
                             std::string() /* default_value */,
                             PrefService::UNSYNCABLE_PREF);
 }