Added member data to classes to support download resumption.

content/browser/download/mock_download_file.cc

Index: content/browser/download/mock_download_file.cc
diff --git a/content/browser/download/mock_download_file.cc b/content/browser/download/mock_download_file.cc
index 8165bc0d4afcb9a933e061794dad1922a872d17e..f6f407064154e89c9d93ae8949535e6d914bcee8 100644
--- a/content/browser/download/mock_download_file.cc
+++ b/content/browser/download/mock_download_file.cc
@@ -107,6 +107,14 @@ bool MockDownloadFile::GetSha256Hash(std::string* hash) {
   return false;
 }
 
+std::string MockDownloadFile::GetSha256HashState() {
+  return "";
+}
+
+bool MockDownloadFile::SetSha256HashState(const std::string& hash_state) {
+  return false;
+}
+
 // DownloadFileInterface implementation.
 void MockDownloadFile::CancelDownloadRequest() {
 }