Files.app: Show error messages for the case the source file is not exists.

chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc

Index: chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
index 3e551b2ed9aa6c36443ea36b8d2a41accfaefd3c..1c8a1417af51dea5302d3c44887522a03a0e718b 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
@@ -246,12 +246,16 @@ bool FileBrowserPrivateGetStringsFunction::RunImpl() {
   SET_STRING("COPY_ITEMS_REMAINING", IDS_FILE_BROWSER_COPY_ITEMS_REMAINING);
   SET_STRING("COPY_TARGET_EXISTS_ERROR",
              IDS_FILE_BROWSER_COPY_TARGET_EXISTS_ERROR);
+  SET_STRING("COPY_SOURCE_NOT_FOUND_ERROR",
+             IDS_FILE_BROWSER_COPY_SOURCE_NOT_FOUND_ERROR);
   SET_STRING("COPY_FILESYSTEM_ERROR", IDS_FILE_BROWSER_COPY_FILESYSTEM_ERROR);
   SET_STRING("COPY_UNEXPECTED_ERROR", IDS_FILE_BROWSER_COPY_UNEXPECTED_ERROR);
   SET_STRING("MOVE_FILE_NAME", IDS_FILE_BROWSER_MOVE_FILE_NAME);
   SET_STRING("MOVE_ITEMS_REMAINING", IDS_FILE_BROWSER_MOVE_ITEMS_REMAINING);
   SET_STRING("MOVE_TARGET_EXISTS_ERROR",
              IDS_FILE_BROWSER_MOVE_TARGET_EXISTS_ERROR);
+  SET_STRING("MOVE_SOURCE_NOT_FOUND_ERROR",
+             IDS_FILE_BROWSER_MOVE_SOURCE_NOT_FOUND_ERROR);
   SET_STRING("MOVE_FILESYSTEM_ERROR", IDS_FILE_BROWSER_MOVE_FILESYSTEM_ERROR);
   SET_STRING("MOVE_UNEXPECTED_ERROR", IDS_FILE_BROWSER_MOVE_UNEXPECTED_ERROR);
   SET_STRING("ZIP_FILE_NAME", IDS_FILE_BROWSER_ZIP_FILE_NAME);