Refactor the code for loading icons into the PageInfoModel.

base/mac_util_unittest.mm

Index: base/mac_util_unittest.mm
diff --git a/base/mac_util_unittest.mm b/base/mac_util_unittest.mm
index f590ac1439d2730bad91d5458d2271a66ea2d2ec..45b3c0ebeabb4c9db22ee4ab5f67a472081cca51 100644
--- a/base/mac_util_unittest.mm
+++ b/base/mac_util_unittest.mm
@@ -180,6 +180,17 @@ TEST_F(MacUtilTest, CopyNSImageToCGImage) {
   EXPECT_TRUE(cgImage.get());
 }
 
+TEST_F(MacUtilTest, NSObjectRetainRelease) {
+  scoped_nsobject<NSArray> array([[NSArray alloc] initWithObjects:@"foo", nil]);
+  EXPECT_EQ(1U, [array retainCount]);
+
+  mac_util::NSObjectRetain(array);
+  EXPECT_EQ(2U, [array retainCount]);
+
+  mac_util::NSObjectRelease(array);
+  EXPECT_EQ(1U, [array retainCount]);
+}
+
 }  // namespace
 
 }  // namespace mac_util