Replace TabStripTest.TabHitTestMaskWhenStacked with something more meaningful.

chrome/browser/ui/views/tabs/tab.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_BROWSER_UI_VIEWS_TABS_TAB_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 156 matching lines @@
   //
   // This returns the inverse (dx/dy instead of dy/dx) because we use exact
   // values for the vertical distances between points and then compute the
   // horizontal deltas from those.
   static float GetInverseDiagonalSlope();
 
  private:
   friend class AlertIndicatorButtonTest;
   friend class TabTest;
   friend class TabStripTest;
-  FRIEND_TEST_ALL_PREFIXES(TabStripTest, TabHitTestMaskWhenStacked);
   FRIEND_TEST_ALL_PREFIXES(TabStripTest, TabCloseButtonVisibilityWhenStacked);
 
   // The animation object used to swap the favicon with the sad tab icon.
   class FaviconCrashAnimation;
 
   class TabCloseButton;
   class ThrobberView;
 
   // gfx::AnimationDelegate:
   void AnimationProgressed(const gfx::Animation* animation) override;
@@ skipping 177 matching lines @@
 
   // The favicon for the tab. This might be the sad tab icon or a copy of
   // data().favicon and may be modified for theming. It is created on demand
   // and thus may be null.
   gfx::ImageSkia favicon_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_