Reland r242290, r241609, r242134.

chrome/browser/ui/cocoa/bookmarks/bookmark_sync_promo_controller_unittest.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_sync_promo_controller.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
+#include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
-typedef BrowserWithTestWindowTest BookmarkSyncPromoControllerTest;
+class BookmarkSyncPromoControllerTest : public BrowserWithTestWindowTest {
+ public:
+  virtual void SetUp() {
+    BrowserWithTestWindowTest::SetUp();
+    ASSERT_TRUE(profile());
+    // Adds TestExtensionSystem, since signin uses the gaia auth extension.
+    static_cast<extensions::TestExtensionSystem*>(
+        extensions::ExtensionSystem::Get(profile()))->CreateExtensionService(
+            CommandLine::ForCurrentProcess(), base::FilePath(), false);
+  }
+};
 
 TEST_F(BookmarkSyncPromoControllerTest, SignInLink) {
   int starting_tab_count = browser()->tab_strip_model()->count();
 
   base::scoped_nsobject<BookmarkSyncPromoController> syncPromo(
       [[BookmarkSyncPromoController alloc] initWithBrowser:browser()]);
 
   // Simulate clicking the "Sign in" link.
   [syncPromo textView:nil clickedOnLink:nil atIndex:0u];
 
   // A new tab should have been opened.
   int tab_count = browser()->tab_strip_model()->count();
   EXPECT_EQ(starting_tab_count + 1, tab_count);
 }
 
 }  // namespace