More pre-MD odds and ends.

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 fb14e9f1958b145213f0ab98e43378e61e886d54..a17e5c008a7501cdca64c74dea76a6105a797da8 100644
--- a/chrome/common/extensions/api/extension_action/action_info.cc
+++ b/chrome/common/extensions/api/extension_action/action_info.cc
@@ -73,7 +73,9 @@ std::unique_ptr<ActionInfo> ActionInfo::Load(const Extension* extension,
         *error = base::ASCIIToUTF16(errors::kInvalidPageActionIconPath);
         return std::unique_ptr<ActionInfo>();
       }
-      result->default_icon.Add(extension_misc::EXTENSION_ICON_ACTION, path);
+      // 19 is the old size for extension icons (the size that was in use at the
+      // time of kPageActionIcons).

[Peter Kasting, 2016/10/26 03:28:47]

Nit: Shorter: "Extension icons were 19 DIP when kPageActionIcons was supported."

[Evan Stade, 2016/11/02 00:41:13]

Done.

+      result->default_icon.Add(19, path);
     }
 
     std::string id;