Converts usage of SetProp/GetProp to a map. Even after making sure we

app/app.gyp

Index: app/app.gyp
diff --git a/app/app.gyp b/app/app.gyp
index 2c8e7f7e80827fbd051949f1f06966e90de7caba..ce64955938557b5b2faa06e8f0d0a39258ce2cc1 100644
--- a/app/app.gyp
+++ b/app/app.gyp
@@ -56,6 +56,7 @@
         'text_elider_unittest.cc',
         'tree_node_iterator_unittest.cc',
         'tree_node_model_unittest.cc',
+        'view_prop_unittest.cc',
         'win_util_unittest.cc',
       ],
       'include_dirs': [
@@ -75,6 +76,7 @@
         ['OS!="win"', {
           'sources!': [
             'os_exchange_data_win_unittest.cc',
+            'view_prop_unittest.cc',
             'win_util_unittest.cc',
           ],
         }],