Revert of ozone: Add sync flag for atomic commit

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

Index: ui/ozone/platform/drm/gpu/drm_device.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_device.cc b/ui/ozone/platform/drm/gpu/drm_device.cc
index d3471f2f7b0faaa0ff5ad21770af32ae0cead723..b547b080874550287f0c9fd3090a19e38b05ba7d 100644
--- a/ui/ozone/platform/drm/gpu/drm_device.cc
+++ b/ui/ozone/platform/drm/gpu/drm_device.cc
@@ -488,31 +488,14 @@
 
 bool DrmDevice::CommitProperties(drmModePropertySet* properties,
                                  uint32_t flags,
-                                 bool is_sync,
                                  const PageFlipCallback& callback) {
 #if defined(USE_DRM_ATOMIC)
-  flags |= DRM_MODE_PAGE_FLIP_EVENT;
-  if (!is_sync)
-    flags |= DRM_MODE_PAGE_FLIP_ASYNC;
   scoped_ptr<PageFlipPayload> payload(
       new PageFlipPayload(base::ThreadTaskRunnerHandle::Get(), callback));
   if (!drmModePropertySetCommit(file_.GetPlatformFile(), flags, payload.get(),
                                 properties)) {
     // If successful the payload will be removed by the event
     ignore_result(payload.release());
-
-    // If the flip was requested synchronous or if no watcher has been installed
-    // yet, then synchronously handle the page flip events.
-    if (is_sync || !watcher_) {
-      TRACE_EVENT1("drm", "OnDrmEvent", "socket", file_.GetPlatformFile());
-
-      drmEventContext event;
-      event.version = DRM_EVENT_CONTEXT_VERSION;
-      event.page_flip_handler = HandlePageFlipEventOnUI;
-      event.vblank_handler = nullptr;
-
-      drmHandleEvent(file_.GetPlatformFile(), &event);
-    }
     return true;
   }
   return false;