cros: Fix a comparison of a bool with -1

chrome/browser/chromeos/extensions/wallpaper_private_api.cc

Index: chrome/browser/chromeos/extensions/wallpaper_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/wallpaper_private_api.cc b/chrome/browser/chromeos/extensions/wallpaper_private_api.cc
index 646f0ecd5592b9581499a214cc91eb1aed7e57eb..e08cb178ab5a5212d7076b909de59c17fdae4b88 100644
--- a/chrome/browser/chromeos/extensions/wallpaper_private_api.cc
+++ b/chrome/browser/chromeos/extensions/wallpaper_private_api.cc
@@ -90,7 +90,7 @@ bool GetData(int key, const std::string& file_name, std::string* data) {
   FilePath file_path = data_dir.Append(file_name);
 
   return !file_util::PathExists(file_path) ||
-         (file_util::ReadFileToString(file_path, data) != -1);
+         !file_util::ReadFileToString(file_path, data);
 }
 
 class WindowStateManager;