Change browser/page action default icon defined in manifest to support hidpi.

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..e5b8b911658280d2094f7c16591b0fb8c73a5b43 100644
--- a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
@@ -126,7 +126,8 @@ scoped_ptr<base::DictionaryValue> DefaultsToValue(ExtensionAction* action) {
   dict->SetInteger(kAppearanceStorageKey,
                    action->GetIsVisible(kTabId) ?
                        ExtensionAction::ACTIVE : ExtensionAction::INVISIBLE);
-  dict->SetString(kIconStorageKey, ImageToString(action->GetIcon(kTabId)));
+  dict->SetString(kIconStorageKey,
+                  ImageToString(action->GetIcon(kTabId, NULL)));
 
   return dict.Pass();
 }
@@ -418,9 +419,7 @@ bool ExtensionActionSetIconFunction::RunExtensionAction() {
     // set. Until we decide what to do with that, ignore.
     if (!GetExtension()->page_action())
       return true;
-    if (icon_index < 0 ||
-        static_cast<size_t>(icon_index) >=
-            extension_action_->icon_paths()->size()) {
+    if (!extension_action_->IsValidIconIndex(icon_index)) {
       error_ = kIconIndexOutOfBounds;
       return false;
     }