exhibit 1: explicit null checks

chrome/browser/extensions/api/extension_action/extension_actions_api.cc

Index: chrome/browser/extensions/api/extension_action/extension_actions_api.cc
diff --git a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
index 7b4cd1f1ec81085d8d53513249ccdd3b1fce8854..5dda96382d07c65cef10b18abab3c86c9a3717ef 100644
--- a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
@@ -73,7 +73,8 @@ bool StringToSkBitmap(const std::string& str, SkBitmap* bitmap) {
 // Conversion function for reading/writing to storage.
 std::string ImageToString(const gfx::Image& image) {
   IPC::Message bitmap_pickle;
-  IPC::WriteParam(&bitmap_pickle, image.AsBitmap());
+  IPC::WriteParam(&bitmap_pickle,
+                  image.IsEmpty() ? SkBitmap() : *image.ToSkBitmap());
   std::string raw_str(static_cast<const char*>(bitmap_pickle.data()),
                       bitmap_pickle.size());
   std::string base64_str;