chrome: Cleanup class/struct forward declarations

chrome/browser/ui/search/instant_test_utils.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_SEARCH_INSTANT_TEST_UTILS_H_
 #define CHROME_BROWSER_UI_SEARCH_INSTANT_TEST_UTILS_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_instant_controller.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/location_bar/location_bar.h"
 #include "chrome/browser/ui/search/instant_controller.h"
 #include "chrome/common/search/search_types.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
 class BrowserInstantController;
 class InstantController;
-class InstantModel;
 class OmniboxView;
 
 namespace content {
 class WebContents;
 };
 
 // This utility class is meant to be used in a "mix-in" fashion, giving the
 // derived test class additional Instant-related functionality.
 class InstantTestBase {
  protected:
@@ skipping 71 matching lines @@
   // HTTPS Testing server, started on demand.
   net::EmbeddedTestServer https_test_server_;
 
   // Set to true to initialize suggestions URL in default search provider.
   bool init_suggestions_url_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantTestBase);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_TEST_UTILS_H_