Cleanup: Remove unneeded browser_thread.h usage.

chrome/browser/extensions/extension_webnavigation_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.
 
 // Tests common functionality used by the Chrome Extensions webNavigation API
 // implementation.
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "base/values.h"
-#include "chrome/browser/browser_thread.h"
 #include "chrome/browser/extensions/extension_webnavigation_api.h"
 #include "chrome/browser/renderer_host/test/test_render_view_host.h"
 #include "chrome/browser/tab_contents/test_tab_contents.h"
 #include "chrome/test/testing_profile.h"
 
 
 class FrameNavigationStateTest : public RenderViewHostTestHarness {
 };
 
 // Test that a frame is correctly tracked, and removed once the tab contents
@@ skipping 72 matching lines @@
   // Navigations to a network error page should be ignored.
   navigation_state.TrackFrame(frame_id2, GURL(), false, true, contents());
   EXPECT_TRUE(navigation_state.CanSendEvents(frame_id1));
   EXPECT_FALSE(navigation_state.CanSendEvents(frame_id2));
 
   // However, when the frame navigates again, it should send events again.
   navigation_state.TrackFrame(frame_id2, url, false, false, contents());
   EXPECT_TRUE(navigation_state.CanSendEvents(frame_id1));
   EXPECT_TRUE(navigation_state.CanSendEvents(frame_id2));
 }