Get rid of extensions dependency from content\browser.

content/browser/site_instance_unittest.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 "base/stl_util-inl.h"
 #include "base/string16.h"
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
@@ skipping 32 matching lines @@
   virtual content::WebUIFactory* GetWebUIFactory() {
     return &factory_;
   }
 
  private:
   SiteInstanceTestWebUIFactory factory_;
 };
 
 class SiteInstanceTest : public testing::Test {
  public:
+  SiteInstanceTest() : old_browser_client_(NULL) {
+  }
+
   virtual void SetUp() {
+    old_browser_client_ = content::GetContentClient()->browser();
     content::GetContentClient()->set_browser(&browser_client_);
   }
 
+  virtual void TearDown() {
+    content::GetContentClient()->set_browser(old_browser_client_);
+  }
+
  private:
   MessageLoopForUI message_loop_;
 
   SiteInstanceTestBrowserClient browser_client_;
+  content::ContentBrowserClient* old_browser_client_;
 };
 
 class TestBrowsingInstance : public BrowsingInstance {
  public:
   TestBrowsingInstance(Profile* profile, int* deleteCounter)
       : BrowsingInstance(profile),
         use_process_per_site(false),
         deleteCounter_(deleteCounter) {
   }
 
@@ skipping 485 matching lines @@
       GURL("chrome-extension://baz/bar")));
   EXPECT_EQ(s5a, s5b);
 
   // The derived profiles with the different sites.
   scoped_refptr<SiteInstance> s6a(instance1->GetSiteInstanceForURL(
       GURL("chrome-extension://baz/bar")));
   scoped_refptr<SiteInstance> s6b(instance3->GetSiteInstanceForURL(
       GURL("chrome-extension://foo/boo")));
   EXPECT_NE(s6a, s6b);
 }