Fix "unused variable" warnings.

ui/compositor/test/test_compositor_host_ozone.cc

 // 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.
 
 #include "ui/compositor/test/test_compositor_host.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 12 matching lines @@
                           ui::ContextFactory* context_factory);
   ~TestCompositorHostOzone() override;
 
  private:
   // Overridden from TestCompositorHost:
   void Show() override;
   ui::Compositor* GetCompositor() override;
 
   gfx::Rect bounds_;
 
-  ui::ContextFactory* context_factory_;
-
   ui::Compositor compositor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestCompositorHostOzone);
 };
 
 TestCompositorHostOzone::TestCompositorHostOzone(
     const gfx::Rect& bounds,
     ui::ContextFactory* context_factory)
     : bounds_(bounds),
-      context_factory_(context_factory),
       compositor_(context_factory, base::ThreadTaskRunnerHandle::Get()) {}
 
 TestCompositorHostOzone::~TestCompositorHostOzone() {}
 
 void TestCompositorHostOzone::Show() {
   // Ozone should rightly have a backing native framebuffer
   // An in-memory array draw into by OSMesa is a reasonble
   // fascimile of a dumb framebuffer at present.
   // GLSurface will allocate the array so long as it is provided
   // with a non-0 widget.
   // TODO(rjkroege): Use a "real" ozone widget when it is
   // available: http://crbug.com/255128
   compositor_.SetAcceleratedWidget(1);
   compositor_.SetScaleAndSize(1.0f, bounds_.size());
 }
 
 ui::Compositor* TestCompositorHostOzone::GetCompositor() {
   return &compositor_;
 }
 
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,
     ui::ContextFactory* context_factory) {
   return new TestCompositorHostOzone(bounds, context_factory);
 }
 
 }  // namespace ui