[Chromecast] Rename disable_display flag to is_cast_audio_only.

ui/ozone/platform/cast/ozone_platform_cast.cc

 // Copyright 2015 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/ozone/platform/cast/ozone_platform_cast.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 70 matching lines @@
   void InitializeUI() override {
     overlay_manager_.reset(new OverlayManagerCast());
     cursor_factory_.reset(new CursorFactoryOzone());
     input_controller_ = CreateStubInputController();
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
 
     // Enable dummy software rendering support if GPU process disabled
     // or if we're an audio-only build.
     // Note: switch is kDisableGpu from content/public/common/content_switches.h
     bool enable_dummy_software_rendering = true;
-#if !BUILDFLAG(DISABLE_DISPLAY)
+#if !BUILDFLAG(IS_CAST_AUDIO_ONLY)
     enable_dummy_software_rendering =
         base::CommandLine::ForCurrentProcess()->HasSwitch("disable-gpu");
-#endif  // BUILDFLAG(DISABLE_DISPLAY)
+#endif  // BUILDFLAG(IS_CAST_AUDIO_ONLY)
 
     if (enable_dummy_software_rendering)
       surface_factory_.reset(new SurfaceFactoryCast());
   }
   void InitializeGPU() override {
     surface_factory_.reset(new SurfaceFactoryCast(std::move(egl_platform_)));
     g_gpu_platform_support.Get() =
         base::MakeUnique<GpuPlatformSupportCast>(surface_factory_.get());
   }
 
@@ skipping 12 matching lines @@
 
 OzonePlatform* CreateOzonePlatformCast() {
   const std::vector<std::string>& argv =
       base::CommandLine::ForCurrentProcess()->argv();
   std::unique_ptr<chromecast::CastEglPlatform> platform(
       chromecast::CastEglPlatformShlib::Create(argv));
   return new OzonePlatformCast(std::move(platform));
 }
 
 }  // namespace ui