drive: Always use last_modified stored in ResourceEntry

chrome/browser/chromeos/drive/file_system/download_operation.cc

Index: chrome/browser/chromeos/drive/file_system/download_operation.cc
diff --git a/chrome/browser/chromeos/drive/file_system/download_operation.cc b/chrome/browser/chromeos/drive/file_system/download_operation.cc
index 18f7546e8ec5d260b8c603379d5af6541e97b18e..ba89f002951724c52ccf689267dfc2c059b97f88 100644
--- a/chrome/browser/chromeos/drive/file_system/download_operation.cc
+++ b/chrome/browser/chromeos/drive/file_system/download_operation.cc
@@ -114,7 +114,7 @@ FileError CheckPreConditionForEnsureFileDownloaded(
       return FILE_ERROR_FAILED;
 
     *cache_file_path = gdoc_file_path;
-    SetPlatformFileInfoToResourceEntry(file_info, entry);
+    entry->mutable_file_info()->set_size(file_info.size);
     return FILE_ERROR_OK;
   }
 
@@ -164,7 +164,7 @@ FileError CheckPreConditionForEnsureFileDownloaded(
   // drive::FileSystem::CheckLocalModificationAndRun. We should merge them.
   base::File::Info file_info;
   if (base::GetFileInfo(*cache_file_path, &file_info))
-    SetPlatformFileInfoToResourceEntry(file_info, entry);
+    entry->mutable_file_info()->set_size(file_info.size);
 
   return FILE_ERROR_OK;
 }