Ensure that --disable-extensions disables extension prefs from being enacted

chrome/browser/extensions/test_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/test_extension_prefs.h"
 
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
@@ skipping 30 matching lines @@
   mutable base::Time currentTime;
 
   virtual base::Time GetCurrentTime() const {
     currentTime += base::TimeDelta::FromSeconds(10);
     return currentTime;
   }
 };
 
 }  // namespace
 
-TestExtensionPrefs::TestExtensionPrefs() : pref_service_(NULL) {
+TestExtensionPrefs::TestExtensionPrefs()
+    : pref_service_(NULL),
+      extensions_disabled_(false) {
   EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
   preferences_file_ = temp_dir_.path().AppendASCII("Preferences");
   extensions_dir_ = temp_dir_.path().AppendASCII("Extensions");
   EXPECT_TRUE(file_util::CreateDirectory(extensions_dir_));
 
   RecreateExtensionPrefs();
 }
 
 TestExtensionPrefs::~TestExtensionPrefs() {}
 
@@ skipping 23 matching lines @@
   PrefServiceMockBuilder builder;
   builder.WithUserFilePrefs(preferences_file_);
   builder.WithExtensionPrefs(
       new ExtensionPrefStore(extension_pref_value_map_.get(), false));
   pref_service_.reset(builder.Create());
   ExtensionPrefs::RegisterUserPrefs(pref_service_.get());
 
   prefs_.reset(new MockExtensionPrefs(pref_service_.get(),
                                       temp_dir_.path(),
                                       extension_pref_value_map_.get()));
+  prefs_->Init(extensions_disabled_);
 }
 
 scoped_refptr<Extension> TestExtensionPrefs::AddExtension(std::string name) {
   DictionaryValue dictionary;
   dictionary.SetString(extension_manifest_keys::kName, name);
   dictionary.SetString(extension_manifest_keys::kVersion, "0.1");
   return AddExtensionWithManifest(dictionary, Extension::INTERNAL);
 }
 
 scoped_refptr<Extension> TestExtensionPrefs::AddApp(std::string name) {
@@ skipping 35 matching lines @@
 
 std::string TestExtensionPrefs::AddExtensionAndReturnId(std::string name) {
   scoped_refptr<Extension> extension(AddExtension(name));
   return extension->id();
 }
 
 PrefService* TestExtensionPrefs::CreateIncognitoPrefService() const {
   return pref_service_->CreateIncognitoPrefService(
       new ExtensionPrefStore(extension_pref_value_map_.get(), true));
 }
+
+void TestExtensionPrefs::set_extensions_disabled(bool extensions_disabled) {
+  extensions_disabled_ = extensions_disabled;
+}