Update old syntax for action default_icon to populate 19 and 38px icons

chrome/common/extensions/api/extension_action/action_info.cc

Index: chrome/common/extensions/api/extension_action/action_info.cc
diff --git a/chrome/common/extensions/api/extension_action/action_info.cc b/chrome/common/extensions/api/extension_action/action_info.cc
index 1068dacea09291cc48ce71871b9d0f06a7e53e22..95fea8f54d9fee7b2fd3e1451b6da3ba033d1070 100644
--- a/chrome/common/extensions/api/extension_action/action_info.cc
+++ b/chrome/common/extensions/api/extension_action/action_info.cc
@@ -105,7 +105,11 @@ scoped_ptr<ActionInfo> ActionInfo::Load(const Extension* extension,
     } else if (dict->GetString(keys::kPageActionDefaultIcon, &default_icon) &&
                manifest_handler_helpers::NormalizeAndValidatePath(
                    &default_icon)) {
-      result->default_icon.Add(extension_misc::EXTENSION_ICON_ACTION,
+      // Choose the most optimistic (highest) icon density - e.g. 38 not 19 -
+      // regardless of the actual icon resolution, whatever that happens to be.
+      // Code elsewhere knows how to scale 38 down to 19.
+      result->default_icon.Add(extension_misc::EXTENSION_ICON_ACTION *
+                                   extension_misc::kNumExtensionActionIconSizes,
                                default_icon);
     } else {
       *error = base::ASCIIToUTF16(errors::kInvalidPageActionIconPath);