Get rid of extensions dependency from content\browser.

chrome/test/unit/chrome_test_suite.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/test/unit/chrome_test_suite.h"
 
 #include "app/app_paths.h"
 #include "base/command_line.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/metrics/stats_table.h"
@@ skipping 81 matching lines @@
 #if defined(OS_MACOSX)
   chrome_application_mac::RegisterCrApp();
 #endif
 
   base::mac::ScopedNSAutoreleasePool autorelease_pool;
 
   base::TestSuite::Initialize();
 
   // Initialize the content client which that code uses to talk to Chrome.
   content::SetContentClient(&chrome_content_client_);
+  content::GetContentClient()->set_browser(&chrome_browser_content_client_);
 
   chrome::RegisterChromeSchemes();
   host_resolver_proc_ = new LocalHostResolverProc();
   scoped_host_resolver_proc_.Init(host_resolver_proc_.get());
 
   chrome::RegisterPathProvider();
   app::RegisterPathProvider();
   content::RegisterPathProvider();
   ui::RegisterPathProvider();
   g_browser_process = new TestingBrowserProcess;
@@ skipping 40 matching lines @@
   delete g_browser_process;
   g_browser_process = NULL;
 
   // Tear down shared StatsTable; prevents unit_tests from leaking it.
   base::StatsTable::set_current(NULL);
   delete stats_table_;
   RemoveSharedMemoryFile(stats_filename_);
 
   base::TestSuite::Shutdown();
 }