cc: Remove the unused compositor thread variable and interface.

content/browser/renderer_host/render_widget_host_view_browsertest.cc

 // Copyright (c) 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 "base/barrier_closure.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "content/browser/gpu/compositor_util.h"
@@ skipping 924 matching lines @@
   gfx::Rect copy_rect(200, 100);
   // Output is being down-scaled since output_size is in phyiscal pixels.
   gfx::Size output_size(200, 100);
   bool video_frame = true;
   PerformTestWithLeftRightRects(html_rect_size,
                                 copy_rect,
                                 output_size,
                                 video_frame);
 }
 
+#if defined(OS_CHROMEOS)
+// On ChromeOS there is no software compositing.
+static const auto kTestCompositingModes = testing::Values(GL_COMPOSITING);
+#else
+static const auto kTestCompositingModes =
+    testing::Values(GL_COMPOSITING, SOFTWARE_COMPOSITING);
+#endif
+
 INSTANTIATE_TEST_CASE_P(GLAndSoftwareCompositing,
                         CompositingRenderWidgetHostViewBrowserTest,
-                        testing::Values(GL_COMPOSITING, SOFTWARE_COMPOSITING));
+                        kTestCompositingModes);
 INSTANTIATE_TEST_CASE_P(GLAndSoftwareCompositing,
                         CompositingRenderWidgetHostViewBrowserTestTabCapture,
-                        testing::Values(GL_COMPOSITING, SOFTWARE_COMPOSITING));
+                        kTestCompositingModes);
 INSTANTIATE_TEST_CASE_P(
     GLAndSoftwareCompositing,
     CompositingRenderWidgetHostViewBrowserTestTabCaptureHighDPI,
-    testing::Values(GL_COMPOSITING, SOFTWARE_COMPOSITING));
+    kTestCompositingModes);
 
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 }  // namespace
 }  // namespace content