Revert of Remove applyAuthorStyles flag from ShadowRoot.

LayoutTests/fast/css/style-scoped/style-scoped-apply-author-styles-expected.txt

Index: LayoutTests/fast/css/style-scoped/style-scoped-apply-author-styles-expected.txt
diff --git a/LayoutTests/fast/css/style-scoped/style-scoped-apply-author-styles-expected.txt b/LayoutTests/fast/css/style-scoped/style-scoped-apply-author-styles-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e6e3f92f360a73d0e2074fd81733a4b7dd8dc238
--- /dev/null
+++ b/LayoutTests/fast/css/style-scoped/style-scoped-apply-author-styles-expected.txt
@@ -0,0 +1,37 @@
+CONSOLE WARNING: 'ShadowRoot.applyAuthorStyles' is deprecated.
+PASS window.internals is defined.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+test a scoped style in document is applied to a node in shadow dom subtree when apply-author-styles is true.
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(255, 0, 0)"
+test a style in an enclosing shadow dom tree is applied to a node in shadow subtree when apply-author-styles is true.
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(255, 0, 0)"
+test a scoped style in an enclosing shadow dom tree is applied to a node in shadow subtree when apply-author-styles is true and the node is in the scope.
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(255, 0, 0)"
+PASS borderColor is "rgb(0, 0, 0)"
+test styles declared in enclosing shadow trees should be applied to an enclosed shadow tree whose apply-atur-styles is true.
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 255)"
+PASS borderColor is "rgb(0, 0, 255)"
+test a style in document is applied to nodes in multiple shadow subtrees when apply-author-styles is true.
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 255)"
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 255)"
+PASS borderColor is "rgb(255, 0, 0)"
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(0, 0, 255)"
+PASS borderColor is "rgb(0, 0, 0)"
+PASS borderColor is "rgb(255, 0, 0)"
+PASS borderColor is "rgb(0, 0, 255)"
+PASS borderColor is "rgb(0, 0, 0)"
+test a style is applied in document order.
+PASS borderColor is "rgb(255, 255, 0)"
+PASS borderColor is "rgb(0, 128, 0)"
+