ozone: Remove USE_LINEAR when allocating modeset buffers.

ui/ozone/platform/drm/gpu/drm_thread.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/drm/gpu/drm_thread.h"
 
 #include <gbm.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 22 matching lines @@
 class GbmBufferGenerator : public ScanoutBufferGenerator {
  public:
   GbmBufferGenerator() {}
   ~GbmBufferGenerator() override {}
 
   // ScanoutBufferGenerator:
   scoped_refptr<ScanoutBuffer> Create(const scoped_refptr<DrmDevice>& drm,
                                       uint32_t format,
                                       const gfx::Size& size) override {
     scoped_refptr<GbmDevice> gbm(static_cast<GbmDevice*>(drm.get()));
-    return GbmBuffer::CreateBuffer(gbm, format, size,
-                                   GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR);
+    // TODO(dcastagna): Use GBM_BO_USE_MAP modifier once minigbm exposes it.
+    return GbmBuffer::CreateBuffer(gbm, format, size, GBM_BO_USE_SCANOUT);
   }
 
  protected:
   DISALLOW_COPY_AND_ASSIGN(GbmBufferGenerator);
 };
 
 class GbmDeviceGenerator : public DrmDeviceGenerator {
  public:
   GbmDeviceGenerator(bool use_atomic) : use_atomic_(use_atomic) {}
   ~GbmDeviceGenerator() override {}
@@ skipping 218 matching lines @@
                                        correction_matrix);
 }
 
 // DrmThread requires a BindingSet instead of a simple Binding because it will
 // be used from multiple threads in multiple processes.
 void DrmThread::AddBinding(ozone::mojom::DeviceCursorRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace ui