Mac: Make clang compile unit_tests.

chrome/browser/background_contents_service_unittest.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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/background_contents_service.h"
@@ skipping 50 matching lines @@
   void SendOpenedNotification() {
     string16 frame_name = ASCIIToUTF16("background");
     BackgroundContentsOpenedDetails details = {
         this, frame_name, appid_ };
     NotificationService::current()->Notify(
         NotificationType::BACKGROUND_CONTENTS_OPENED,
         Source<Profile>(profile_),
         Details<BackgroundContentsOpenedDetails>(&details));
   }
 
-  virtual const void Navigate(GURL url) {
+  virtual void Navigate(GURL url) {
     url_ = url;
     NotificationService::current()->Notify(
         NotificationType::BACKGROUND_CONTENTS_NAVIGATED,
         Source<Profile>(profile_),
         Details<BackgroundContents>(this));
   }
   virtual const GURL& GetURL() const { return url_; }
 
   void MockClose(Profile* profile) {
     NotificationService::current()->Notify(
@@ skipping 142 matching lines @@
   contents->Navigate(url);
   EXPECT_EQ(1U, GetPrefs(&profile)->size());
   contents2->Navigate(url2);
   EXPECT_EQ(2U, GetPrefs(&profile)->size());
   service.ShutdownAssociatedBackgroundContents(ASCIIToUTF16("appid"));
   EXPECT_FALSE(service.IsTracked(contents));
   EXPECT_EQ(NULL, service.GetAppBackgroundContents(ASCIIToUTF16("appid")));
   EXPECT_EQ(1U, GetPrefs(&profile)->size());
   EXPECT_EQ(url2.spec(), GetPrefURLForApp(&profile, contents2->appid()));
 }