Convert base::MemoryMappedFile to use File instead of PlatformFile.

ui/base/resource/data_pack.cc

Index: ui/base/resource/data_pack.cc
diff --git a/ui/base/resource/data_pack.cc b/ui/base/resource/data_pack.cc
index 8f8f18224448baf2b1762782dfcd96a535a16c42..56d74a2786855f7676d1b022ff82b5ad596c7195 100644
--- a/ui/base/resource/data_pack.cc
+++ b/ui/base/resource/data_pack.cc
@@ -84,9 +84,9 @@ bool DataPack::LoadFromPath(const base::FilePath& path) {
   return LoadImpl();
 }
 
-bool DataPack::LoadFromFile(base::PlatformFile file) {
+bool DataPack::LoadFromFile(base::File file) {
   mmap_.reset(new base::MemoryMappedFile);
-  if (!mmap_->Initialize(file)) {
+  if (!mmap_->Initialize(file.Pass())) {
     DLOG(ERROR) << "Failed to mmap datapack";
     UMA_HISTOGRAM_ENUMERATION("DataPack.Load", INIT_FAILED_FROM_FILE,
                               LOAD_ERRORS_COUNT);