Split ExtensionTestObserver and move to //extensions.

chrome/browser/extensions/process_manager_browsertest.cc

 // 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.
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/test_extension_dir.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/extension_process_policy.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/child_process_security_policy.h"
@@ skipping 810 matching lines @@
               popup->GetMainFrame()->GetLastCommittedOrigin());
     EXPECT_EQ("foo", GetTextContent(popup->GetMainFrame()));
 
     EXPECT_EQ(3 + i,
               pm->GetRenderFrameHostsForExtension(extension->id()).size());
     EXPECT_EQ(3 + i, pm->GetAllFrames().size());
   }
 }
 
 }  // namespace extensions