drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc

Index: ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc b/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc
index 5cee091d8ca4051f020f6b56dbfb163a4027bdaf..724cd705215e86e2ed1183c8591af41cb62299d5 100644
--- a/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc
+++ b/ui/ozone/platform/drm/gpu/drm_gpu_display_manager.cc
@@ -69,7 +69,7 @@ std::vector<DisplaySnapshot_Params> DrmGpuDisplayManager::GetDisplays() {
   ScopedVector<DrmDisplay> old_displays(displays_.Pass());
   std::vector<DisplaySnapshot_Params> params_list;
 
-  const DrmDeviceVector& devices = drm_device_manager_->GetDrmDevices();
+  DrmDeviceVector devices = drm_device_manager_->GetDrmDevices();
   // Unique identifier used to create the display id.
   size_t index = 0;
   for (const auto& drm : devices) {
@@ -96,7 +96,7 @@ std::vector<DisplaySnapshot_Params> DrmGpuDisplayManager::GetDisplays() {
 }
 
 bool DrmGpuDisplayManager::TakeDisplayControl() {
-  const DrmDeviceVector& devices = drm_device_manager_->GetDrmDevices();
+  DrmDeviceVector devices = drm_device_manager_->GetDrmDevices();
   for (const auto& drm : devices) {
     if (!drm->SetMaster()) {
       LOG(ERROR) << "Failed to take control of the display";
@@ -108,7 +108,7 @@ bool DrmGpuDisplayManager::TakeDisplayControl() {
 }
 
 bool DrmGpuDisplayManager::RelinquishDisplayControl() {
-  const DrmDeviceVector& devices = drm_device_manager_->GetDrmDevices();
+  DrmDeviceVector devices = drm_device_manager_->GetDrmDevices();
   for (const auto& drm : devices) {
     if (!drm->DropMaster()) {
       LOG(ERROR) << "Failed to relinquish control of the display";