Clean up remaining unused globals (on mac).

cc/trees/layer_tree_host_unittest_context.cc

 // Copyright 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "base/basictypes.h"
 #include "cc/debug/test_context_provider.h"
 #include "cc/debug/test_web_graphics_context_3d.h"
 #include "cc/layers/content_layer.h"
@@ skipping 1558 matching lines @@
 MULTI_THREAD_TEST_F(
     LayerTreeHostContextTestLoseOutputSurfaceDuringReadbackAndForcedDraw);
 
 // This test verifies that losing an output surface right before a
 // simultaneous readback and forced redraw works and does not deadlock.
 class LayerTreeHostContextTestReadbackWithForcedDrawAndOutputSurfaceInit
     : public LayerTreeHostContextTest {
  protected:
   static const int kFirstOutputSurfaceInitSourceFrameNumber = 0;
   static const int kReadbackSourceFrameNumber = 1;
-  static const int kReadbackReplacementSourceFrameNumber = 2;
   static const int kForcedDrawCommitSourceFrameNumber = 2;
   static const int kSecondOutputSurfaceInitSourceFrameNumber = 2;
 
   LayerTreeHostContextTestReadbackWithForcedDrawAndOutputSurfaceInit()
       : did_lose_context_(false) {}
 
   virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
     // This enables forced draws after a single prepare to draw failure.
     settings->timeout_and_draw_when_animation_checkerboards = true;
     settings->maximum_number_of_failed_draws_before_draw_is_forced_ = 1;
@@ skipping 655 matching lines @@
         EXPECT_TRUE(impl->CanDraw());
         break;
     }
   }
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(UIResourceLostEviction);
 
 }  // namespace
 }  // namespace cc