Re-enable tabs_interactive_uitest for linux_aura

chrome/test/base/ui_test_utils.h

 // Copyright (c) 2012 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_TEST_BASE_UI_TEST_UTILS_H_
 #define CHROME_TEST_BASE_UI_TEST_UTILS_H_
 
 #include <map>
 #include <queue>
 #include <set>
@@ skipping 277 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(HistoryEnumerator);
 };
 
 // Use in browser interactive uitests to wait until a browser is set to active.
 // To use create and call WaitForActivation().
 // TODO(warx): check if code base exists the requirement for deactivation sync,
 // this class can be modified to support that.
 class BrowserActivationWaiter : public chrome::BrowserListObserver {
  public:
-  explicit BrowserActivationWaiter(Browser* browser);
+  explicit BrowserActivationWaiter(const Browser* browser);
   ~BrowserActivationWaiter() override;
 
   // Returns when the |browser_| which is supplied by the constructor becomes
   // activated. If it is not activated, a message loop is used until the
   // |browser_| is activated, otherwise this returns immediately.
   void WaitForActivation();
 
  private:
   // chrome::BrowserListObserver override:
   void OnBrowserSetLastActive(Browser* browser) override;
 
-  Browser* browser_;
+  const Browser* browser_;
   bool observed_;
   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActivationWaiter);
 };
 
 }  // namespace ui_test_utils
 
 #endif  // CHROME_TEST_BASE_UI_TEST_UTILS_H_