Refactor the code for loading icons into the PageInfoModel.

base/mac_util.mm

Index: base/mac_util.mm
diff --git a/base/mac_util.mm b/base/mac_util.mm
index e017fe7b2035778885094310c60857fadd769b05..6924e6a5800544298bcccd71bee76b6d00685cfe 100644
--- a/base/mac_util.mm
+++ b/base/mac_util.mm
@@ -669,4 +669,14 @@ bool WasLaunchedAsHiddenLoginItem() {
   return IsHiddenLoginItem(item);
 }
 
+void NSObjectRetain(void* obj) {
+  id<NSObject> nsobj = static_cast<id<NSObject> >(obj);
+  [nsobj retain];
+}
+
+void NSObjectRelease(void* obj) {
+  id<NSObject> nsobj = static_cast<id<NSObject> >(obj);
+  [nsobj release];
+}
+
 }  // namespace mac_util