Generalize ExtensionIconSet to store icon paths for custom size sets

chrome/browser/extensions/tab_helper.cc

Index: chrome/browser/extensions/tab_helper.cc
diff --git a/chrome/browser/extensions/tab_helper.cc b/chrome/browser/extensions/tab_helper.cc
index fb191e746dccf0cad4483f651431c983e1bf14ea..23900fc388080386a29970940b1c97227d7b1974 100644
--- a/chrome/browser/extensions/tab_helper.cc
+++ b/chrome/browser/extensions/tab_helper.cc
@@ -372,10 +372,10 @@ void TabHelper::UpdateExtensionAppIcon(const Extension* extension) {
     extension_app_image_loader_.reset(new ImageLoadingTracker(this));
     extension_app_image_loader_->LoadImage(
         extension,
-        extension->GetIconResource(ExtensionIconSet::EXTENSION_ICON_SMALLISH,
+        extension->GetIconResource(extension_misc::EXTENSION_ICON_SMALLISH,
                                    ExtensionIconSet::MATCH_EXACTLY),
-        gfx::Size(ExtensionIconSet::EXTENSION_ICON_SMALLISH,
-                  ExtensionIconSet::EXTENSION_ICON_SMALLISH),
+        gfx::Size(extension_misc::EXTENSION_ICON_SMALLISH,
+                  extension_misc::EXTENSION_ICON_SMALLISH),
         ImageLoadingTracker::CACHE);
   } else {
     extension_app_image_loader_.reset(NULL);