Add ProgressCallback to DriveServiceInterface::DownloadFile.

chrome/browser/google_apis/base_operations_server_unittest.cc

Index: chrome/browser/google_apis/base_operations_server_unittest.cc
diff --git a/chrome/browser/google_apis/base_operations_server_unittest.cc b/chrome/browser/google_apis/base_operations_server_unittest.cc
index 65f0513b2d980492e7c94471f67242b069eff5e6..81f566d5b3cf8db56913c080a96fcd5d162772cd 100644
--- a/chrome/browser/google_apis/base_operations_server_unittest.cc
+++ b/chrome/browser/google_apis/base_operations_server_unittest.cc
@@ -89,6 +89,7 @@ TEST_F(BaseOperationsServerTest, DownloadFileOperation_ValidFile) {
           base::Bind(&test_util::RunAndQuit),
           test_util::CreateCopyResultCallback(&result_code, &temp_file)),
       GetContentCallback(),
+      ProgressCallback(),
       test_server_.GetURL("/files/chromeos/gdata/testfile.txt"),
       base::FilePath::FromUTF8Unsafe("/dummy/gdata/testfile.txt"),
       GetTestCachedFilePath(
@@ -124,6 +125,7 @@ TEST_F(BaseOperationsServerTest,
           base::Bind(&test_util::RunAndQuit),
           test_util::CreateCopyResultCallback(&result_code, &temp_file)),
       GetContentCallback(),
+      ProgressCallback(),
       test_server_.GetURL("/files/chromeos/gdata/no-such-file.txt"),
       base::FilePath::FromUTF8Unsafe("/dummy/gdata/no-such-file.txt"),
       GetTestCachedFilePath(