Refactor BaseFile methods to return a DownloadInterruptReason instead of a net::Error.

content/browser/download/save_file.cc

Index: content/browser/download/save_file.cc
diff --git a/content/browser/download/save_file.cc b/content/browser/download/save_file.cc
index cd0acba48237e7a9d4efc774158dba1a1d8280cd..91fe2acf27acb1e36c30819df9d646da612d861e 100644
--- a/content/browser/download/save_file.cc
+++ b/content/browser/download/save_file.cc
@@ -34,15 +34,16 @@ SaveFile::~SaveFile() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 }
 
-net::Error SaveFile::Initialize() {
+content::DownloadInterruptReason SaveFile::Initialize() {
   return file_.Initialize(FilePath());
 }
 
-net::Error SaveFile::AppendDataToFile(const char* data, size_t data_len) {
+content::DownloadInterruptReason SaveFile::AppendDataToFile(const char* data,
+                                                            size_t data_len) {
   return file_.AppendDataToFile(data, data_len);
 }
 
-net::Error SaveFile::Rename(const FilePath& full_path) {
+content::DownloadInterruptReason SaveFile::Rename(const FilePath& full_path) {
   return file_.Rename(full_path);
 }