Generalize ExtensionIconSet to store icon paths for custom size sets

chrome/browser/chromeos/extensions/file_browser_private_api.cc

Index: chrome/browser/chromeos/extensions/file_browser_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/file_browser_private_api.cc b/chrome/browser/chromeos/extensions/file_browser_private_api.cc
index 0d018fea5c840107bc68fbeb2eb4c8dd687fda83..73e18d09a427e1ab411a9b421fda4b009e8d943e 100644
--- a/chrome/browser/chromeos/extensions/file_browser_private_api.cc
+++ b/chrome/browser/chromeos/extensions/file_browser_private_api.cc
@@ -40,6 +40,7 @@
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_icon_set.h"
 #include "chrome/common/extensions/file_browser_handler.h"
 #include "chrome/common/pref_names.h"
@@ -693,7 +694,7 @@ bool GetFileTasksFileBrowserFunction::RunImpl() {
     // manifest instead of the default extension icon.
     GURL icon =
         ExtensionIconSource::GetIconURL(extension,
-                                        ExtensionIconSet::EXTENSION_ICON_BITTY,
+                                        extension_misc::EXTENSION_ICON_BITTY,
                                         ExtensionIconSet::MATCH_BIGGER,
                                         false, NULL);     // grayscale
     task->SetString("iconUrl", icon.spec());