Change namespace from ui to gfx for NativePixmap related code

ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.cc

 // Copyright 2016 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/common/client_native_pixmap_dmabuf.h"
 
 #include <fcntl.h>
 #include <linux/version.h>
 #include <stddef.h>
 #include <sys/mman.h>
@@ skipping 44 matching lines @@
   struct local_dma_buf_sync sync_end = {0};
 
   sync_end.flags = LOCAL_DMA_BUF_SYNC_END | LOCAL_DMA_BUF_SYNC_RW;
   if (drmIoctl(dmabuf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_end))
     PLOG(ERROR) << "Failed DMA_BUF_SYNC_END";
 }
 
 }  // namespace
 
 // static
-std::unique_ptr<ClientNativePixmap> ClientNativePixmapDmaBuf::ImportFromDmabuf(
+std::unique_ptr<gfx::ClientNativePixmap>
+ClientNativePixmapDmaBuf::ImportFromDmabuf(
     const gfx::NativePixmapHandle& handle,
     const gfx::Size& size) {
   return base::WrapUnique(new ClientNativePixmapDmaBuf(handle, size));
 }
 
 ClientNativePixmapDmaBuf::ClientNativePixmapDmaBuf(
     const gfx::NativePixmapHandle& handle,
     const gfx::Size& size)
     : pixmap_handle_(handle), size_(size), data_{0} {
   TRACE_EVENT0("drm", "ClientNativePixmapDmaBuf");
@@ skipping 64 matching lines @@
   uint8_t* address = reinterpret_cast<uint8_t*>(data_);
   return address + pixmap_handle_.planes[plane].offset;
 }
 
 int ClientNativePixmapDmaBuf::GetStride(size_t plane) const {
   DCHECK_LT(plane, pixmap_handle_.planes.size());
   return pixmap_handle_.planes[plane].stride;
 }
 
 }  // namespace ui