Remove Style.Resources setter.

We don't need it.

src/Avalonia.Styling/Styling/Style.cs

@@ -49,18 +49,6 @@ namespace Avalonia.Styling
 
                 return _resources;
             }
-
-            set
-            {
-                var resources = Resources;
-                if (!Equals(resources, value))
-                {
-                    foreach (var i in value)
-                    {
-                        resources[i.Key] = i.Value;
-                    }
-                }
-            }
         }
 
         /// <summary>

tests/Avalonia.Styling.UnitTests/ResourceTests.cs

@@ -20,7 +20,7 @@ namespace Avalonia.Styling.UnitTests
                 {
                     new Style
                     {
-                        Resources = new ResourceDictionary
+                        Resources =
                         {
                             { "Foo", "foo resource" },
                             { "Bar", "overridden" },
@@ -33,14 +33,14 @@ namespace Avalonia.Styling.UnitTests
                     {
                         new Style
                         {
-                            Resources = new ResourceDictionary
+                            Resources =
                             {
                                 { "Bar", "again overridden" },
                             }
                         },
                         new Style
                         {
-                            Resources = new ResourceDictionary
+                            Resources =
                             {
                                 { "Bar", "bar resource" },
                             }
@@ -64,7 +64,7 @@ namespace Avalonia.Styling.UnitTests
                     {
                         new Style
                         {
-                            Resources = new ResourceDictionary
+                            Resources =
                             {
                                 { "Foo", "foo" },
                             }